adding a fixture as furniture in a full program?

adding a fixture as furniture in a full program?

Hello all. I was just curious on an answer if there would be any issue adding furniture (of a fixture that isn't made yet)

Here is a picture. the red is going to be the fixture. I have points on the bottom of the zig zag area. However, I have already moved them up knowing that a pin would be in the fixture.

Basically all I'm trying to ask is it problematic to add a fixture furniture to an already created program?