I have created a taxonomy named Category which has a number of terms like Agriculture, Business, Computers, etc.
I have created three content types viz. Products, Suppliers and Buyers. All of these types use the terms from the Category taxonomy.
What I am trying to do is create a block named Supplier Categories which as the name suggests, displays a list of terms from the Category taxonomy which are associated to Suppliers. So say if you have Suppliers associated to the Agriculture and Business categories then this Block should show them. It shouldn't show Computers though because no Supplier uses this term.
I am not sure whether this is possible or not but I have spent a lot of time playing with blocks but I couldn't get it to work.
By the way, I am trying to do this using Drupal 7.