Customizing filter drop down in data view in Sharepoint Designer [closed]

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I have a dataviewwebpart with filtering, sorting and grouping enabled for a list, done using SharePoint designer. The list has some category columns that are used in filter dropdowns appearing as a toolbar above the data view when deployed. How can I remove them from the dropdown?
I googled on this and found that dvt.filterfield is what populates the filter dropdowns. Currently, my dataview is as follows:
Filter Sort by dropdown Group by dropdown

List...

When I click on filter all the columns currently in the list appear as filter options. Repeating my question, I want to remove 2-3 columns from the options displayed. How do I do that?
Hope this question is clear. I'll post a screenshot of the site if anybody needs it. Thanks.

Answer 1

Found just the link I wanted. Here(if anybody does wanna know): Advanced DVWB sorting and filtering