you have to enter the hardware as an item.  is it inventory?  enable inventory in preferences.

 

Resolution for 'COG hardware issue: 'how do i charge customer for COG hardware?' available: Yes.

The COG hardware 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 COG hardware issue yourself by looking for a resolution described in the article. If it is a complex COG hardware issue or you are unable to solve the issue, you may contact us by clicking here or by using other COG hardware support options.

For more information about resolving issues related to COG hardware in Quickbooks/QBO or to get support for the issue 'how do i charge customer for COG hardware?', click the link below: