The POSitive Consignment feature may not be flexible enough for your type of business.
An alternative option is to treat the consignor as a vendor and receive product through purchase orders. All products from the consignor are assigned under a specific category or department for the consignor.
For example, with Sally Smith as the consignor, create a department named Consignments and a category named Sally Smith.
You can run inventory counts and sales reports on just the Sally Smith category.
When running a Valuation Report, choose a Query to exclude the Sally Smith category.