Customise sorting option on Collection page

Thanks for the above @Jasoliya

Is there a way to ADD a sort option?

As several people have noted elsewhere 'Sort by’ : Date, old to new, or Date, new to old

use the date-time the Product was added to the database - and unless products are added in the right sequence when first creating the store, there seems no way of altering/correctling it subsequently.

The best alternative for us would be to replace these two sorts with their 'Sort by’ : SKU equivalents

  • as (in our case) low skus are older than higher skus.