As of version 1.5 of USP Pro, it’s possible to exclude categories on a per-form basis.
To do so, just add the
exclude attribute to the
[usp_category] shortcode, like so:
Then specify whichever categories you would like to exclude from the global USP settings (located at General ▸ Categories ▸ Post Categories). The excluded categories should be a list of category ids separated by commas if more than one. Any excluded categories will not be displayed on the USP Form.