When to trade into a Endgame
In general, here are some scenarios where it is more likely favorable to trade into an endgame.
2 Bishops advantage, especially against 2 knights. Just make sure the position is atleast relatively open.
Having a protected passed pawn. Again usually.
Having rooks on the 7th.
There are many examples, and so this question is kind of bad. It all depends on the position, and you need to get a feel for them.
If you have a specific position, then I would be happy to advise.