How to calculate a CFrame offset?

For example, I have CFrame A and B. I want to make a CFrame offset called C and A*C will be B. But I don’t know how?
Please help me with this, and thank you!

You just use algebra. A*C = B. If A has a position.X of 50, and B has a position.X of 25, you will divide each side by A (50), and C = B/A, which equals .5, You will then do this same formula with The X,Y, and Z values of both the rotation and the position.

This is one for the X position

Local XPosition = B.Position.X/A.Position.X

I already found the solution. I can just use :ToObjectSpace().