multiple joins

Hi

I am new to Knime so am still feeling my way around - any help would be appreciated

I have multiple xls files (although in the future i think they could be any format) that i want to join together. I have one file as my base and then would like to join (left outer) other files as needed.

I want to join reference tables which wouldnt have the same columns as the core set of data (although of course there will be links to each set)

The most pertinent example i can find is the joiner but is limited to 2 joins. Ideally i dont want to have to do join on join so am looking for an alternative solution.

I am exploring using a loop to bring in all the sets in one area but not sure if i am heading the right direction

Thanks