Using Bulk editor for sizes

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Hi all, we are new to Shopify but we had a store on Ecwid.  I mainly have apparel items on our store that we make and sell.  I used Cart2Cart app to move all my products over but they said because of a limit they put how many variations can be transferred most of my apparel listings now only show sizes Small- Large.  I need to add sizes XL-3X to most of these.  I looked into using the bulk editor, but it does not give that as a variation I can change.  Does anyone know how to do this.  I have almost 90 apparel items and do not want to edit each one.

Thank you