Merging Bought Assets / Creating own Toolkit

To explain this better. I have numerous packages bought from the asset store. Is there a way to merge, or to create from them my own default toolkit.

Examples being, I have Maintainer - Simple LUT Adjuster and The Shelf. Can I merge these somehow so I have to only install 1 package.

Another example being, I have Integrity Software’s packages, can I combine the models, and the shaders, Each into their own single packages?

Sorry if this is a real basic question, I have done a good search for an answer, to no avail.

Thanks for your time.
Adam Over

Yes, you select the assets you want to group together and go Assets → Export Package. You can then import that single package into your other projects.

https://docs.unity3d.com/Manual/HOWTO-exportpackage.html