QB Issue Resolution:

Well no you told QB to sell one each

you want to sell half of one, so sell 0.5

or when you stock one pound, set the qty purchased to 2 per pound purhased, then selling one will be equal to half a pound

Resolution for Issue 'how do I buy 1 unit and sell 2 units of .5 each and keep he inventory correct' available: Yes (Solved).
Source: Intuit Community forum.

how do I buy 1 unit and sell 2 units of .5 each and keep he inventory correct: 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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