Lasse:
This is one option: Your input method uses the Absolute Coordinates (the direction is input
before the distance). To use the Relative Coordinates (the direction is input
after the distance), type "x 2 - -" and "y 2 - -" (spaces added for clarity). [The second "-" is the separator between feet and inches, in this case showing 0 inches.]
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David