Don't know but you could try by displaying model number temporarily and obtaining the full url mentioned earlier. Cut and paste it somewhere like notepad. Then go ahead and enter the sort order number (2a, 3a, etc.) into the Product Listing Default Sort Order.
After doing that, turn the display of the model number back off. Now try to go to the url you saved earlier and if things display in the expected order chances are it will work. Now simply check it by:
1. close your browser (or clear your cache)
2. open your browser again and navigate back to your product listing and see if it is still in the proper order. My guess is that it will be the way you want.
Ron
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