Any tips and tricks on how to “glue” vocal harmonies together in your mix?

I am currently producing an Rnb track for a project and you know with Rnb they have many vocal harmonies and blending involved so I was wondering what are your tips and tricks into “gluing” them together in your mixes. Is it an EQ thing, do I have to use like automations or panning in the faders to make them sound like their together.

I would love some tips (FYI I mix with stock plugins so I would also love tips as well in mixing using those)