. If you don't already have BOSS installed (and if not, why not?!!) then install it first. Run BOSS and it'll put your mods into the correct order, and will automatically tag them with the appropriate tags that Wrye Bash needs in order to create the bashed patch. Once you've installed Wrye Bash, open it up and click on the 'mods' tab. You'll see 'bashed patch, 0.esp' listed at the bottom of your load order. Right-click on this, and select 'rebuild bashed patch' from the list.
You'll now see your bashed patch options. Make sure 'leveled lists' is checked, and make sure 'automatic' is checked, and then click 'Build bashed patch'.
So I've been using a bashed patch for some of my mods for a long time now but recently I've added in a few extra mods that also modify the.