No, you can't apply a target beyond 1. However, you can cheat and apply the same target more than once. To do so, figure out what the name of the target is (all breast targets are here:
https://bitbucket.org/MakeHuman/makehum ... at=default), and copy the target file to v1/data/custom/ in your makehuman home (see
http://www.makehumancommunity.org/wiki/FAQ:Where_are_my_MakeHuman_files_found_(where_is_my_HOME_directory)%3F). Rename the copied target file to whatever you want (but keep the .target extension), just so it doesn't have the original name.
Now you can find the copied target under the "custom" tab on modeling, and there you can apply it a second time.
This is a quick and easy solution, but might look strange. A more involved approach is to model a new target, which would give you complete control over the end result. See
http://www.makehumancommunity.org/wiki/ ... on:Targets