As sketchup doesnt have any kind of modifier stack though, I like to 'hide' the non modified version of the object inside the component. As it is hidden it won't be exported as geometry and it allows you to go back easily and make changes. In the image above, I have a hidden copy of the window frame 2m to the right that I can move back into place and redo the bevel/fillet if needed.
FredoScale
A great plugin for doors and windows, you can take a group and stretch it but retain the width of the frame. In the image below, the original door is on the left, the fredoscale stretch version next, and the scaled one on the right. It can do a LOT more but I just use it for this one function.