What is the condition you're using to identify the products in bold ?
You will need to use "and" so it considers both of these conditions for the same record in the where clause.
Theoretically, if you have an additional flag that indicates a bold product, your code could look like this:
Load Product, Location
where Location like 'M*' AND Product_Bold = 1;
If this doesn't answer the request, it would be helpful if you can clarify more.