I want to change angle of surfaces to +/- 1 deg. The surfaces have green/orange colour as in the picture below.
After the changing I want to have something like below.
3D model in attachment. If it possible please create movie step by step to do it.
first I thought what a simple question, this just is either a draft surface or since YOu already have replacement surfaces there, a Surface Replace feature.
But both of them didn't work.
After inspecting Your part I have seen that there is a problem surface (cylinder R9) which goes downwards into the model area.
So I first also trimmed this surface back to the plane
Then export as STEP and reimport with all healing options on, moving the part and optimize the model
And now a simple Draft with Split option ons did the job.
See video and finished part.
Attention: draft angle might not be 1 degree just to see the draft angle better in the model