YITH Booking – Custom Fields [PluginHELP]

Im copying a site and changing theme,
Old site within YITH product -> Cost -> Advanced Price Rules -> Conditions
Theres a custom fieldField label: Min Duration

on the new site i dont have this field: Functions.php
when adding snippets related to it, site just errors.
Is there some files i may need to drag over ? Anyone got any experience with YITH Booking and editing it/customising it?


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