QB Issue Resolution:

You can do an inventory adjust, set the adjusting account to COGS and lower the qty of the items used

or

you can “sell” those same item to the customer on an invoice/ sales receipt for a zero sale price, keep it in house do not send out then you have a record of what was used for that job/customer

Resolution for Issue 'Do you know how to decrease inventory? Exmple:The invoice is a lump sum of $2000. How do I take the 30 items that were used on this job out of inventory?' available: Yes (Solved).
Source: Intuit Community forum.

Do you know how to decrease inventory? Exmple:The invoice is a lump sum of $2000. How do I take the 30 items that were used on this job out of inventory?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for 30 items
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for 30 items [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.

Get 50% off Quickbooks Online

Click Here for 50% off!

Additional Support Options: