Is there a mod manager or something?
Do you mean on the forums, in the game, in your computer?
A bit more details would help with what you want…
There are no mod managers for GD mods.
The only way to merge mods is manual.
Welcome to GD, fan of Torchlight II ! There isn’t a mod manager like Torchlight II 
You must do it manual
[Tutorial] How to merge two different mastery mods together ( Thanks to Somerled ! He used too much intensify in his tutorial thread :eek: )