I use 2 systems:
1)The (main) Calibre {series} is Hierarchical .
Legend of Drizzt.Silent Blade[4]
I also have a Custom (series type) column {#split_series}
I use this 2 ways: alternate numbering:
Legend of Drizzt [9]
or
Alternate series (crossovers)
Joanna Brady &J.P. Beaumont
Note I adjust Preferences: Searching: Grouped Searches (tab) and Similar Books (tab) to search both
I also use this (indexed at 0) for hierarchical levels that would get to deep (would cause file path issues).
<the series parent layers go here > and I drop those in the main {series}
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