Is it possible to use a sort of constant or a custom token in the rewrite section of a views field? My use case.

I have a portion of a URL of another site (www.example1.com) under each of my nodes (let's say node type B).

Each of these nodes can be related with another node (let's say node type A).

I need a view which show informations of A nodes and get the URL portions from B nodes using the relationship section of the view.

That's ok, I get what I want but I would like to create a URL with this URL's portion adding a constant/token at the beginning (www.example1.com) so that it can changed in a simple way (let's say www.example2.com) instead of modify each field of the view.

My best bet should be probably to rewrite the template of the view and using a constant (variable_get/set should be fine) but I would like to have this field configurable with the UI.

Thanks
If I'm understanding the question properly, you can either use a hidden field on a node to create a node specific value which you can rewrite as a link if desired, or create a Global:Custom Text where you can include whatever static or variable data you desire, so long as the fields containing the information are present (visible or not).