each item is unique, so yes you would need 1234-blk, 1234-wht, etc

No there is no group item in QBO that will sell multiple items by selecting one, you have to select each and every item

sub items are unique and are only used to organize the list, you have to order […]

Resolution for 'color variations issue: 'Is there a way to set up an item that will add 6 pieces to an order? How about color variations?' available: Yes.

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

For more information about resolving issues related to color variations in Quickbooks/QBO or to get support for the issue 'Is there a way to set up an item that will add 6 pieces to an order? How about color variations?', click the link below: