if you do - you can import them into a file
with File >Import > (obj)
and navigate to your obj file
the object probably won’t appear straight away
if it doesn’t - add a new object (say a cube) and then click on the arrows next the the ME:
(in the edit buttons) and change it to your new object
Are the topologies of the two separate meshes similar? If so, it should be easy … if not, it’s just a bit more work.
In Edit mode, select the vertices making up the head you want to remove, and delete them. Then select both meshes in Object mode, and use [Ctrl+J] to join them. Now back in Edit mode, attach the vertices at some point on the neck.
Unless you have modifiers on one object that you want to keep, as opposed to the other objects’ modifiers. Every object merged to another object has it’s modifiers replaced with the “active” object’s modifiers (the last object selected).
And you would also to want to re-parent or re-weight your mesh, if there’s an armature involved.
K, Cool, Done that, now my texture for the head is messing up as the original model had the head and body all in one texture and the new body has a different shape and texture that I wanna keep, for the torso only, Any advice on how to fix the texture without having to completely redraw and reset the head texture? (By The Way, I Should’ve mentioned that I’m still a 3d animation and modeling noob, I’m actually tryna pick up some general 3d animation and modeling skills because it interests me.)