Yes you can.  It’s super easy.  Go to the Fitment Workbench for the fitment protocol you’ve tagged to (Redbook, TecDoc or eBay) and click the Replicate Fitment button at the top of the page.  Then search for the SKU you already tagged.  Tick the checkbox beside it and then enter the SKU code/s of the other SKU/s you want the same fitment to be applied to, and then click the blue Replicate button on the right.  Easy.