I don't think you can do that, at least not if you want a 'live' connection to your detail library. That would basically be a hotlinked module, which is a feature not supported in Solo.
Your options might be:
1. File>Interoperability>Merge, which would join the files into one.
2. Copy from one file and paste into another. Works fine, but not a live connection (if you update the detail library file, and want the udate in the project file, you'll have to copy and paste again.
3. Use File>External Content>Place External Drawing - I believe this could provide a live connection to dwg or pdf files, but not to another ArchiCAD files. You'd also have to use Drawing Manger to update to the linked file ( a click of a button).
4. You could put at least some of the details into your template file. Might be cumbersome, and again no means to update.
ArchiCAD 22
Win 10