No you can not, you will have to remember to order/purchase each item individually in QBO

You can do that for sales using a bundle item, but unlike desktop you can not use that bundle item (group item in desktop) on a PO or bill

Resolution for 'automatically deducted issue: 'Can I somehow attach multiple inventory items to a product so they are automatically deducted when the product is purchased?' available: Yes.

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

For more information about resolving issues related to automatically deducted in Quickbooks/QBO or to get support for the issue 'Can I somehow attach multiple inventory items to a product so they are automatically deducted when the product is purchased?', click the link below: