So I have an ISO of Pro Pinball the Web, which works fine with Win10 but it has very limited graphics option so I want to run it with Dosbox but I can remember exactly what I need.

I have copied and edited the config files and shortcut from my GOG 'Timeshock' install and the Dosbox folder but the game isnt running.

I keep forgetting how to setup up dosbox games as there is usually a big gap between doing them.

Can I just copy files from the Timeshock install and make it work or do I have to go through all the usual dosbox install process from scratch?

Can't you just start dosbox, mount the iso and install it.
If you have trouble with that I recommend reading through the dosbox tutorials on mounting drives and iso's.

Also I ran The Web maybe a year or so ago in DxWnd, which worked pretty well, I don't remember having missing graphics or anything.