The Part Kits tab is on work orders and the ability to add part kits to work orders.
The tab has a grid displaying information about the part kits; total part kit amounts are at the top right. (Part kits can be set taxable or not taxable from the setup page, which makes all of its parts taxable or not.)
On the work order, the Total Amount tooltip shows the amount contributed from part kits:
Part Kit Parts are issued like regular work order parts, with the warehouse being set from the warehouse on the work order. The part ledger entries use the standard cost of the parts.
The Work Order Print/Email PDF file shows only the Part Kits in the Charges section and not the parts that make up the part kit. (It does continue to show individual items and parts that are not part of the park kit.)