Model numbers? (Tv and vcr/dvd combo)
I'm going to assume that the vcr/dvd combi unit only has a scart connection?
Connect to tv via scart lead
Cable box? Maybe same (plus coax/aerial)
Usually, whilst possible to connect vcr/dvd to cable box, connecting a vcr directly to the cable box may stop the cable box signal coming through to the tv properly (prevent pirating) so right to tv each is best.