I'd like to nominate some relationships from the Law & Order franchise that cross over multiple sub-series, namely L&O Special Victims Unit and L&O Organized Crime.

I'm looking to nominate some relationships between a character primarily from SVU with one primarily from OC.

If the character from OC has appeared in at least one crossover episode of SVU, can I nominate all these relationships under SVU for simplicity's sake? Should I use Crossover Fandom? Should I nominate all L&O franchise tags under an invented meta tag?

Thanks for the help and please let me know if you require any additional info.