move an object on the x,y plane but staying in the 3D view

 From:  hadri1
11862.1 

Hi everyone,

Does someone know how to move a point, in a plane without having to leave the 3D viewport ?
the objective would be to move the point to another curve. (without having to change the current view or doing an extrusion and a cut).
When using the selection frame, it is possible to activate a rotation gumball but is there a way to have a planar translation option in the gumball ?

Thank you !

EDITED: 12 Dec by HADRI1