just delete bold "Tag"

should a whole line is bolded - usually, Tag is hidden between lines
firstly, use "Review > Display Filter > General > All content" then you see it
now, delete it
it could be combined with others..

Nabil Bakri

Just to add to what Kelly suggested, which is correct when the whole sentence is bold because Trados Studio will externalise the control tags for bold so you don't have to worry about them.  This is normally because you would not unbold a sentence that was bold in the source as the idea is to mirror the source.  Note that both opening and closing tags need to be deleted and this would mean you might have to then add back tags if only one sentence in a paragaph like this should be bold instead of the whole thing.  So you can also drag the tags into the target segment to bold only the bits you want.

Also, if your problem is that you just don't see how to unbold something you have bolded because you don't see the tags then press Ctrl+Shift+H and this will display formatting tags (if they are not externalised as in the example above) and then you can simply delete the tags that bold the words you want unbolded.

thank you very much for your help, i managed to un-bold the target using this method. my friend suggested me to use QuickInsert, so i also tried using QuickInsert and that works as well. Once again, thank you very much...

thank you very much, it works! 

good tip