the images speak for themselves: if I understand correctly, you start with a straight U-shaped profile, then once a cut is made, you bend it at 90°.
In a single function this is not possible in solidworks, on the other hand we can possibly create a library function that will come to make the cuts (without redrawing them each time), all that would remain is to make the folds in sketched folds for example.
However, if you start from a geometry directly drawn in 3D, the library function is also a good solution, then use the convert to sheet metal function for example
You say that you always use the same basis. Why not save your document as a template (prtdot)? This way you start from this model each time, you change the dimensions and thus create your new part.