If you mean that you need suggestions on what to use as Item Codes, I would use the same item number that the vendor uses when he gives you a bill.  Failing that, if there are bar codes on your items, use the last 5 digits of the bar code.

Resolution for 'bar codes issue: 'Can you recommend a naming convention for (sales) items?' available: Yes.

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

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