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Custom Size is available on select products, the availability of this feature is set at the HUB only. Storefront licenses do not have access to enable or disable this function.
When available it will be the bottom selection in the size option will be Custom Size
This will present to additional drop downs giving a range of dimensions in increments of .25
The prices that are severed are from the next largest size, for example, if 2.75 x 4.5 has been selected, the price served would be for a 3 x 5
Custom size pricing cannot be set or edited, it will always pull from existing products, if you want o to have editable pricing for sizes that are not available aside from being in custom size, you must create those as actual products of their own.
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