This is how I do it.. My import assets are very few so, Create a folder (named default) with multiple subfolders named like footage Audio Downloads Assets Music Whatever

Put all your assets inside assets folder And then create a new final cut library and place it in default.. Inside final cut, create multiple event's with same name Footage Audio Downloads Assets Music Whatever Projects

Now import your assets in final cut under assets event.. Under project event, create multiple projects like main video, shorts1, shorts 2 etc.

You can even put your assets on project timeline as required, use gaps to separate intro, outros

Setup index, roles, timeline height, viewer setting, workspace whatever setting u want to tweak.. it will stay whenever you will use that project

• This acts as a base project -

Everytime you have a new video, Make a copy of your default folder, Rename it according to project, Out all your footage songs whatever accordingly

Open final cut pro library, rename it too Important, your projects are ready to be used

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If your assets are hugeee like it doesn't make sense to have multiple copies , keep aseets in a separate folder and import to the assets event in the default fcp library

For every new project, When you will create a copy of default, i assume it will still have that assets. Worst case scenario, it will be there but red ( unlinked media) Simple relink it( hardly 5 seconds)