How can I include different animations independently to my 3D model? In my 3D program I have all the animations in the same timeline, but in VTPro it appears as only one. Do I need several models for it?
No, You don't need multiple models for different animations, just one model with multiple animations. To have different animations you have to create them separately in Blender or in the software your are using, instead of animating in a single timeline. There is a way to generate and have separate different animations. In Blender it's basically using the "action editor".
You can search for tutorials on that, for example this one: https://youtu.be/ElkRd074Asg