BabaJ

You could create an attribute based on the points UV on its' prim with the vex function xyzdist()....and use that attribute in a sort SOP.

Dougie0047
Ok,so basically we cannot do any generation from scratch in points, prims, or vertex modes.

You can (based on what you said in your original post that you don't want to delete the 'original').

Before you do your 'from scratch/based on existing points/prim operation' in a wrangle, name the originals prior to the wrangle as a group like 'group_preoperation' or something.

Then running over pts/prims as you desire, in the group parameter box of the wrangle put that group name 'group_preoperation'.

Then whatever new geo you create assign it a different group name like 'group_applied_operation'.

You now have the two sets which can easily be 'split' up independantly downstream of your choice and nothing has been deleted.

Interesting...only have 19.5 open when I tried myself. It seems having your view(home) set to cplane with the sops projection to Screen Plane it will only draw parallel to the cplane going through global center.

However, if I use the curve sop, with grid snapping I can draw on any custum plane.