Look for the lots on the Cost Detail tab of Item Maintenance.  Once there, they should be available for use when invoicing.  If not there, something is wrong with your inventory receipt process (or item settings).

Did you post under Daily Receipts/Updates ?  Go into the item and look at the transaction history. Do you see the Receipt of Goods transaction?

I have no lots on the Cost Detail tab in I/M.

I did post on the Daily Receipts/Updates. There is nothing for the ROG under the Transaction History.

I 1) created a new lot item, 2) add lot item to new Purchase Order, 3) create new Receipt of Goods with new Lot Numbers, 4) Post aka run the Daily Receipts/Updates to add the new inventory.

After doing these steps, I still have no Lot Numbers available to me for my item when I go to create a Sales Order and then Ship that order.