I would like to scale an object to an specific dimension of another object. I know I can measure the dimension first and then type that dimension for to objetc to scale. But I am wondering if I can scale using directly the object like reference. Same proces in autocad with align and resize the object to the size of the reference object.
There are ways to change the size of one component or group relative to another. Can you give a specific example of what you need to do? Best would be to share a SketchUp model so we can see what you are working with.
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I’m having the same problem. I want an octagon 27" from flat side to flat side. So I made an 8 sided circle of radius 13.5". Unfortunately for my goal, the dimensions of the circle tool are from point-to-point, so it’s too small.
I rotated it so that the flat sides are perpendicular to the red/green axis. So, now if I could get the boundary to be 27", then it’d be “correct”.
So, I select the octagon and try to use the scale tool. But the scale tool only allows the multiple of the size, not the actual dimension. 1.15 is “close”, but this is a computer, I should be able to somehow say “make the red axis of this object exactly 27” ". (or the red and green axis)
Sounds like yer workin’ knida hard for that one.
I’d select he Polygon tool, click to set the center, start dragging out the radius, hit Ctrl and then type 13.5, Enter and be done with it.
Or if you really want to do it the hard way, draw your 8-sided circle and drag it out to some random radius. Then get the Tape Measure tool and measure between vertices making sure you click on both vertices. Then type 27, hit Enter and hit Enter again.
I was assuming there might be a way to modify the edge, but I didn’t know how, thanks for the modifier tip 
I discovered I can type the scale after scaling, so scale, then type 27",27" or 27",27",1 depending on whether I’m playing with 2D or 3D objects. My problem was that w/o specifying inches, then it’s just scale (eg: 1.1x) And I’m used to entering dimensions before finishing the object - but then pressing the “shift” modifier for the quotes causes it to change before I finish entering the numbers (and clear the box).
That’ll come in handy with more complicated objects that I can’t just use the tool for.
Hmmm, ctrl doesn’t work for me like your video does 
Oh, I have to use the polygon, not circle tool
It would help if you complete your profile with the SketchUp version and license type.
Yes. As I wrote: