How do I stick a 3d model into another 3d model?

i was trying to put a pickaxe in a character, using 2 separated 3d models, is there a way to stick this pickaxe into the character so that it follow the player movements and animations?

I don't think this feature exists currently. There is another industry standard - include the pickaxe in the model and rig it together with the character. Show and hide it depending on the context along with the animation.