Is it possible to re-use headers in Paw?

I'm creating a group of queries that will all share the exact same set of headers.

Is it possible to create the group of headers once and then copy/paste them to other queries? Or, even better, can I assign a known group of headers to multiple queries?

The best way to do so is to have an environment domain for that. Make one variable per header, you may have a variable called Content-Type (as an example) and give it the application/json value for one environment, or application/xml for another environment. This way you'll be able to switch between JSON and XML in many requests at once.

In the example above, there are 2 variables set, one for the Content-Type and another one for Accept. Both variable are then used in the request. As you can see in the preview at the bottom, the variables are replaced by their values in the HTTP request.