Use the On plane setting in the part properties to view and change the part’s position on the work planeplane that the user has chosen in a model and that is currently active for working on in a model view
Newly created, copied, or moved model objects comply with the work plane. For example, shifting the work plane to follow a sloped plane makes it easier to model sloped structures.
. The position is always relative to part's reference lineline between two reference points
For example, if the user picks two points to position a beam, these points form the reference line, and handles appear at the line ends.
Reference lines can be used in snapping in a snap switch.