QB Issue Resolution:

Open the customer list. click and drag the subsidiary (called the job) directly under the master (called the parent.) drag by clicking on the diamond to the left of the name. then drag to the right to indent the job. repeat for each job.

Resolution for Issue 'How do you convert a customer to a subsidiary of the parent customer in my customer list?' available: Yes (Solved).
Source: Intuit Community forum.

How do you convert a customer to a subsidiary of the parent customer in my customer list?: 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.

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