Hi Claudia,
For each for the fields in question, you can use the \b and \f switches. See:
http://office.microsoft.com/en-us/wo...005186172.aspx
Thus, if you select to 'Arts' mergefield and press Shift-F9, you should see something like:
{MERGEFIELD Arts}
If you change this to:
{MERGEFIELD Arts \b "Arts - " \f "¶
"}
where '¶' is an actual paragraph break, and delete the 'Arts - ' text before the mergefield, that line will only appear if your 'Arts' mergefield has any data.