I can't believe I'm asking this -- talk about stooopid...

Is one supposed to cut back the vines after bearing? If so, how far?
Or?

Neighbor gave me several plants years ago as b'day gift. Now they
have taken up residence all over the garden, and are waving long,
spiny vines at me. Getting a few berries, but should be getting more
(yum!)

I want to centralize them in one area where they can climb up a
trellis but do not know how/whether
to cut back.

This is So.Calif coastal.

TIA

HB