Manage Customers and Income

Actually, there is a way to add a custom column to the "Bill" in Quickbooks.

Add an item (type = other charge) Item name Lot # (Or any name of choice)

Check the box to the left: This Item is used in assemblies or is a reimbursable charge

Assign an expense acct on the left side, Assign a revenue acct on the right side.

Select Custom Fields, (4th option down; top right).

Another window will open, select define and add [Lot #] as the label name, check use, 

and select if you want it REQUIRED for transactions and lists.

Now go to vendors and open the window to enter a bill.

Move your mouse in the blank area of a column and right click for a submenu.

Select customize columns, and select the [Lot#] defined field.

Now you can add a lot# on each line item of the bill.

Recommendation: Do not use required on transactions unless you want a Lot # on every line item of EVERY bill.

Hope this helps those who want to add a custom field to Bills in Quickbooks.

*Custom fields are limited depending on what version of Quickbooks use are using*

Attached are some screenshots