Merging Two Different Access Databases

Hi,

I've asked this on a few other websites with limited or no success.

this is from one db. this table originally had about 20-30 different fields,

WarehouseNum ItemNum load_date Shipped
101 31 6/26/2006 200
101 31 6/27/2006 180
101 338 6/26/2006 162
101 338 6/27/2006 357

this table is from another db. Notice how WarehouseNum is '9' instead of '1' and itemNum is '000'. This is just one of many impediments I face. As well, none of the table fields are the same, I changed them here to make it easier to work with.

SupplierNum ItemNum WarehouseNum PlannedDelDate DeliveredQty
869747 00031 901 6/26/2006 250
869747 00031 901 6/27/2006 300
869747 00338 901 6/26/2006 490
869747 00338 901 6/27/2006 490


The goal here is to query the two simultaneously, perhaps with linked tables, type in an ItemNum using a parameter and know for instance that on the 26th, we received 250 item31 and shipped 200 for a remaining balance of 50. The 50 is what I'm after. Basically, my company uses one program for sales and another for purchasing and absolutely nothing for inventory management. I started with this company about 3 weeks ago and unless i can implement some kind of temporary solution, it will drive me insane.

Advice? Best approach? As well, this db will use data on two different servers
Thanks for the help.
As well, my access experience is limited and our company I.T. is seriously backlogged, besides which, I would like to learn how to do this myself.
Thanks again