There is the provision for Preferred vendor, for your convenience.

The way you “attach” vendors to items is by Purchases. Then, item purchase reports will show who you have ordered from.

Resolution for 'attach multiple issue: 'How can I attach multiple vendors to 1 product?' available: Yes.

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

For more information about resolving issues related to attach multiple in Quickbooks/QBO or to get support for the issue 'How can I attach multiple vendors to 1 product?', click the link below: