Is BRM supports extension of event /event/billing/product/fee/purchase/ to us as product type as ITE

We have our existing purchase fee product, for some reason we want to extend this event "/event/billing/product/fee/purchase/" as ""/event/billing/product/fee/purchase/trans_fee"

and Currently the product type is Item (Note not a Subscription type, I know that subscription type of events can be extended)

I wanted to know how to extend this event and use it for product type ITEM?

or is it supported in BRM ?

when it checks this in pricing center, the moment I select Item as product type, it allows me only the "Purchase fee event", nothing I could see there.