Hi @georgesbrivaelb See the Mechanical Help on "Virtual Topology". We can't change the shape i.e. cut the body into two bodies. But we can cut faces on the body (Virtual Split Face) by two vertices. So if you need to split that face only for meshing or loading, then VT may be the way to go.
p.s. right-click the Model object and VT should be a choice to insert to the tree.