In the Pro version, you create an Assembly item, then build the assembly. There are instructions in the help on POS.
Resolution for 'assembled parts issue: 'Using point of sale 2013 pro, how do I make an item from assembled parts?' available: Yes.
The assembled parts 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 assembled parts issue yourself by looking for a resolution described in the article. If it is a complex assembled parts issue or you are unable to solve the issue, you may contact us by clicking here or by using other assembled parts support options.
For more information about resolving issues related to assembled parts in Quickbooks/QBO or to get support for the issue 'Using point of sale 2013 pro, how do I make an item from assembled parts?', click the link below: