Normally all standard OVS are protected against changes/extensions.
You can manipulate the behaviour/result of an OVS using his binding parameters when adding it to a view. however this in only possible when you are working on custom screen or on a custom embedded component.
If I understand your question correctly, you are talking about an standard screen where the OVS is bound.
You will not be able to change the OVS binding configuration.
In case "Product Category" is available on the OVS FindForm, you can achieve your goal by means of configuration: create a new querie and assign it as default.
In case "Product Category" is not available on the OVS FindForm or you have complex logic, you can achieve your goal by creating your own custom OVS (base on standard OVS) + hide standard field on Ticket TI + create an Embedded component and make hided field available + bind EC field to your OVS.
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