Yes "Dev" is my trunk ans is the root of all other branches. A hotfix is always RI in "Patch" and then in "Dev".
I was thinking of a cumulative branch of hotfixes for each version of patch and then branch it to actually make a patch, but I couldn't select particular hotfixes to make a "mix".
From what I read a hotfix is, most of the time, targetting one customer but how do you allow them to install several hotfixes without losing changes from previous one (like Microsoft's KB).