At any time you can edit the Sub-Products you generated for any Apparel Product by using the Manage Sub-Products feature.
First locate the Apparel Product, and then click on Manage Sub-Products. A window similar to the one shown below will be displayed.
Regardless of which fields you edit, you must check the check-box on the right side of every Sub-Product that is being edited, before you click on the Update Selected button. Use the Check All/Uncheck All links to check or un-check all items on the page.
+/- Units: Use this field, located at the bottom of the page, to update the inventory level for all checked Sub-Products by the number entered in the field.
All Disregard Stock: use this check-box to select that Disregard Stock property for all items on the page. The property will then be set for all checked sub-products when you click on Update Selected.
All Back Order: use this check-box to select that All Back Order property for all items on the page. The property will then be set for all checked sub-products when you click on Update Selected.
If you need to update multiple sub-products at once, another way to do so is trough the
Global Changes feature. The version of this feature contained in the Apparel Add-on allows you to specify whether any of the changes that you wish to apply should be include sub-products of the selected products.