Disable add to cart on a per product or category basis

Hi,

I want to hide my add to cart button on certain products only. So i need a plugin that allows me to remove “add to cart button” on a per product basis and better per category basis.

But i still wanna have the price. Also is it possible if the “add to cart” button is changed to a different button of my own input such as “call now” or whatever i choose and that button will redirect the user to an external link.

It is because my website will have 2 kind of functions, 1 is they can buy at my online store where else the affiliated products will be redirected to the respective brand websites for transactions.

Thanks!