How to build parternships b/w players and how does it affect the team game?

[AshKing15]

I have a general opinion that when players play continously at a position with same players, then they tend to form a partnership with them. Yet, in my team there are just two partnerships (bw CB and bw DMs) made even after 2/3 of the season has passed (I play Barnsley in Premier Division, FA Cup and Euro Cup as well) and I have been using the same tactic for a while now. Maybe there's some training which helps building partnership. Also how does it benefit the team like better cohesion or something?