How do I update Inventory in Access

I have a form where the user enters the item purchased and the quantity - I want that quantity entered in the customer invoice to be deducted from the Quantity_On_Hand field in the Inventory table. What would be the best way to accomplish this? I assume I would need to enter an expression in the after update on the quantity in the customer invoice? What I have tried so far has accomplished nothing but errors

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Count Distinct in Access
I'm trying to do a select count distinct values for a table. Reading a few sites on google, I know that access does not support this. The database is for a library inventory system. I have 2 tables: Book_Copy and Inventory. Book_Copy has the columns (Copy_ID, Book_ID Checkout Date, Check In Date and Due Date, Status). The inventory table has columns: Inventory ID, Book _ID and Available Copies. I am trying to update the Inventory table, Available copies column based on the status (checked in) in the Book_Copy table. I have tried to write an update query trying different ways but all I end up getting is syntax errors. Any help would be appreciated. This is what I have tried:
UPDATE Inventory
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Inventory Form that adds/subtracts from current inventory number in table
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retail and wholsale in a ms access 2007 database
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Update Record using Combo Box To Navigate
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Inflows and outflows of product over time
Learning objectives: gain more experience creating tables, relationships, and queries; gain more experience building multipart
forms; create an event-driven procedure to update inventory levels on receipt of a shipment; understand the difference between inventory tracking and inventory management. (pdf file, install Acrobat Reader to rad this tutorial)

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Private Sub CmdConfirm_Click()
Dim var As Long
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Inventory: add/remove stock qty from table
I hope someone can help me - I haven't touched Access in years and I have been "volunteered" by my employer to write a basic inventory system. I am using Pendragon forms along with the now obsolete Handspring Visor equipped with scanner to scan barcodes and collect data.

What I can't seem to wrap my head around is performing a record lookup from the scanned data (I have a table with scanned data to add to inventory (tblAddInventory), a table with scanned data to remove from inventory (tblRemoveInventory) and a master table with all ofmy warehouse inventory (tblWarehouseMain) and performing a calculation on the records to add - or subtract - stock, depending on what table the data comes from.

I am (er, rather used to be) comfortable with VB.

I have tried to create an update query as well as some basic code via control on a form, but I'm finding myself at a loss. Anyone willing to take a shot at helping or pointing me in the right direction?

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Heres what I need:
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Create purchase orders and receive the inventory to whichever location I need it at. I would like to at some point be able to track where the parts are going.

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* Height (number, ##0.000)
* Width (number, ##0.000)
* Color (number, integer ID field connected to a "colors" table)
* Light Transmission/Transparency (number, #0%)
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1. Setup deposit ( This is where everything gets entered if they get shipment of new items and automatic adds to inventory database )
2. Inventory database ( this is where all items are stored and organized, with pictures of items and add to invoice type feature )
3. Invoice ( this is where items are placed when they are sold and are removed from inventory database )

Thank you guys for your help and this place looks great for me to startthank you.

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so that if one branch still has inventory I don't want thatrecord returned.

what I was using was
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What I would like to do is Choose an "assembly" from a combobox and have the subform open up the list of instruments in the assembly.
Then have 2 textboxes below with "QtyUsed" & "QtyReceived" and a button for "update inventory".

On click event for the button it will update QtyOnHand in list of subform.

Something like "QtyOnHand = QtyOnHand - QtyUsed + QtyReceived"

Can this be done? I have tried several ways but not quite getting it.

Do you make the subform a combobox so when you choose a record it has focus? Or is their a way to show the whole list of records (datasheet view) and still be able to update particular record with buttons below