new offset command

I routinely use two or three offsets for creating walls.  3.5", 5.5", 8" 

In acad i created a custom tool or button so that with one click the offset was initiated with the desired offset.

I have tried to customize in DS but something is wrong with the syntax.  Can someone correct the line....

^c^c_offset;3.5 

maybe the string is not complete.  the ; between offset and 3.5 is for 'enter', right?

 

Thanks,

John