The most useful keyboard shortcuts for ArchiCAD

Save File	Command/CTRL - S
one of the following actions (in this order) - Cancels current editing or drawing operation (if one is in process) Deselects Elements (if any are selected) Removes Marquee (if drawn) Switches to Arrow Tool (if set to another tool)	Escape key
Backs up one step at a time in polywall, polyline or polygon input	Delete(Mac)/Backspace(PC) key
Set coordinate values in Tracker (d = distance = r = radius)	x, y, r, a, d
add current value (whichever coordinate is being edited) to previous value shown in Tracker	+ (plus key)
subtract current value from previous value in Tracker (NOTE: in U.S., two dashes are necessary; one can be a separator between feet and inches, e.g. 5-6-)	- (minus or dash key)
confirm current Tracker values as shown and click mouse	Enter key
In Info Box, set base and top values for wall, beam, column, slab, stair, mesh, object Windows and Doors accept b or t depending on which anchor is set Roofs accept b for pivot line height	b, t
Create Guideline segment	Shift-` (PC) or Custom shortcut (Mac):
Drag, Rotate, Mirror:	Command/CTRL + D, E, M
During Move, Rotate, Mirror or Elevate command, will make a copy	Press and release Option / CTRL key
During Move, Rotate, Mirror or Elevate command, will make multiple copies until the Escape key is pressed	Press and release Option-Command / CTRL-ALT keys
Multiply	Command/CTRL - U
Group, Ungroup, Suspend Groups:	Command/CTRL - G Option-Command/ALT-CTRL - G Option/ALT - G
Element Settings (opens dialog based on which tool is active in Toolbox) Default Settings if nothing is selected; or Selected Element Settings	Command/CTRL - T
Edit Selection Set (allows parameter setting for multiple types of elements in one dialog)	Command-Option/CTRL-ALT - T
Layer Settings dialog	Command/CTRL - L
Trim, Split, Adjust, Intersect, Fillet Drafting shortcuts in the Toolbar: and their keyboard shortcuts including the use of the Command or Control key by itself to Trim pieces with the scissors icon
·         Trim pieces of linear or curved elements ·         Add points to a dimension chain ·         Adjust walls or lines to meet the edge of another element ·         Trim or Crop walls to a specific roof, or one or more roofs to trim or crop a wall	Command / CTRL – Click
Magic Wand	Space-bar – Click
Eye-dropper	Option / ALT – Click
Syringe	Option-Command / ALT-CTRL – Click
Selects different part while transferring parameters, keeps style or “family resemblance”	Option-Command / ALT-CTRL – Click [in library part window]
Activate tool and set default; if elements of that type are selected, injects the saved settings into the element(s)	Favorites palette – double-click
When hovering with the Arrow tool or Shift key over two or more overlapping elements, cycles through elements allowing you to choose which one to select	TAB key
Built-in shortcut to toggle between the Arrow tool and the last used drawing tool	W key
Show Selection/Marquee in 3D	F4 (Mac) / F5 (Windows)
Show All in 3D	Command-F4 / CTRL-F5
Show 3D Window (last-used selection or marquee will be active)	F3
Axonometric view mode	Command/CTRL - F3
Perspective view mode	Option/ALT - F3
Floor Plan	F2
Last Section	F6
Last Layout	F7
In Plan:
Go up a story	Command / CTRL – Up Arrow:
Go down a story	Command / CTRL – Down Arrow:
In Layout Book
Previous Layout	Command / CTRL - Left Arrow
Next Layout	Command / CTRL - Right Arrow
Scroll in that direction	Cursor keys (Left, Right, Up, Down)
Nudge selected element(s) the distance set in the Snap Grid	Shift – Cursor keys (Left, Right, Up, Down)
Nudge selected elements the larger distance set in the Construction Grid	Shift-Option / Shift-ALT – Cursor keys
Turns on or off the Grid Snap (NOTE: this used to be “s” without the Shift-key modifier)	Shift-S
Measure tool; hit M again or Escape to finish Measure mode	M key
In 3D window, triggers Orbit mode; end Orbit by hitting O again or using Escape key	O key
Pan view (note that there is a free add-on called Magic Prefs that makes this work for the Apple Magic Mouse, which does not have any visible buttons)	Mouse middle-button press
In 3D view, activates Orbit mode; release buttons to end Orbit mode	Middle-button plus Shift key
While drawing or editing an element with the mouse constrained on an angle (usually with the Shift key), this will cycle through Cursor Snap Variations.	Q key
While editing an element with a Pet Palette option in effect, this will “flick” through the available Pet Palette options.	F key
Moves User Origin to node point (on the fly)	Shift-Option / ALT-SHIFT
SPECIAL MOUSE CLICKS
Switches to next or previous library part; has the side effect of resetting the library part to the default settings.	Flick buttons [<>] in Library Part Settings or Info Box
In Window or Door Settings or Info Box, will switch to Empty Opening while maintaining the same width and height.	Empty hole button
Select HOLE only (allows the hole to be dragged, drag a copy, multiply, deleted, etc.)	Arrow-click or Shift-click on EDGE of hole (within polygon element such as Slab, Roof, Mesh, Fill, etc.)
Find and Select	ctrl/cmd-F:
adjust: extends (or trims) one or multiple lines/walls to a clicked or virtually drawn line	ctrl/cmd-minus:
split/break a line/wall at the selected intersection (of clicked or virtually drawn line)	ctrl/cmd-B:
zoom to selection. I use zoom extents in Eric's list the most often (ctrl-') but sometimes the project is too huge and selecting an area and zooming just it is faster.	ctrl/cmd-shift-':
intersect (walls/lines)	I:
hairline / true-weight toggle (Marc's cmd-1)	H:
Info Palette - info on selected elements	Shift-I
SEOp palette. (Shift='S'olid, E=Element)	shift-E
selects last created element(s)	ctrl/cmd-Z followed by ctrl/cmd-Shift-Z (Undo/Redo):
open selected object in the GDL editor	ctrl/cmd-shift-O:
Align 3D Texture > Set Origin	shift-O
Align 3D Texture > Reset	shift-P
Toggles True line weights on/off	Command + 1
Toggles trace reference on/off (the tilde key)	"`"

(Thanks to Eric Bobrow and others...

http://archicad-talk.graphisoft.com/viewtopic.php?p=203059#203059)