I usually think of consignment as something you hold or warehouse for someone else. When you sell it, you pay the person who consigned it to you for the agreed value of the item you agreed to consign. Therefore, you have carried it at no cost, but record a sale (what the buyer paid) and cost (what you paid your customer or vendor if you prefer) and then have a method to send funds to your customer/vendor. The remaining dollars are your profit on this transaction.
You could also hold the inventory in your facility and bill it to your customer as they draw out the inventory. In this scenario, the sell and cost are created at the point inventory is sold from your warehouse. This is essentially the same as buying or building for stock so you have on hand when customers want to order. The only difference with anonymous inventory transactions is that you wouldn't sell this inventory to other customers, and you may have a restriction that only the customer to whom it belongs is the only one who can enter orders for those items.
You could also have the scenario of producing or warehousing items for your customer that are sold to third parties. Your customer would notify you or the third party would identify that a sales order should be generated for the product. You then ship & invoice the third party. Sales & cost entries are created. Does these entries need to be communicated to the customer who requested your consignment services? Does the invoice show the third party they should remit to you or to your customer? If you collect the sales dollars from the third party, how do you pay your customer for the funds you collected less cost and commissions? If the customer collects the payments, how do they pay you for the cost of the product plus, I hope, some fee for the warehousing and shipping services you provided?
You could also have the situation where your customer purchased a number of items, but only wants the shipments sent to him or to a third party as needed. In this case, the value of inventory is zero. The invoicing exercise is then one to relieve inventory and to produce shipping documents to accompany the items out the door.
There are other ways handling consignment, too. It all hinges on:
who owns the product in your warehouse?
who can buy this product? 1 customer? Many customers? Certain customers?
who prepares the invoice?
does the invoice show the payment address as you or the consignor.
are the ship to and bill to addresses the same?
are you using alternate address records for ship to information, customer (bill to) address, or one time address changes on the ship to button?
who collects the funds from the ship to or bill to addressee?
how/when does payment occur between you and the consignee?
who is accounting for the end user sales, and what reports provide that information?
Because of the multiple means of configuring your processes, I still think you should engage your reseller to examine what you want to do and how to get there.