I'm just starting to use CorelDraw. How can I extend the width of one side of a shape by 3/8" of an inch?
I think this is what you mean.
1. Unlock the Lock Ratio Button
2. Move the Object Origin to where you want the object to grow from.
3. Add the amount you want the object to grow buy to either Horizontal or vertical fields (you and use all maths symbols here +, -, / Divide & * Multiply)
What you see will make the box increase in length by 25mm in the direction of the arrow.
Hope this helps