Regarding anime metadata

What is the easiest way of grouping a TV anime series without using a S01E01, S01E02, etc… format? For example, a fringe anime like Baby Steps only has a release which isn’t compatible with Infuse’s automatic metadata matching, such as:
[DB]Baby Steps_-01(10bit_1080p_x265).mkv
[DB]Baby Steps_-02(10bit_1080p_x265).mkv
and so on…
What is the easiest way to fix this without renaming the files?

Without renaming your not going to have much luck.

I’d still say rename them like

Baby Steps 2014 S01E01 (10bit_1080p_x265).mkv

That should match up everything.