We can split a line in 2D sketch.

Can we split face edge?

Example:

we make Planar Surface for a circle. It has one edge border.

If sketch contour is no "equivalent to the circle" Planar Surface may have 2 and more edges.

But can we make a planar circular surface with 2 edges? (or better split edges when ever we need)

Thank you !

As Jim Steinmeyer says, you should be able to accomplish what you need using the split line feature:

Basically, it will split the surface into 2 surfaces, which will also neatly result in 2 edges.

Hope that works for you.