How do I create hierarchical taxonomy terms on import nodes?
First make 3 taxonomy feeds importers for each of the tree taxonomy vocabularies separately



Import the terms from the same source file you got - you need only to specify Term Name and matching the right columm under Mapping for "Taxonomy term processor"

In case you want to import taxonomy with the hierarchy, use Taxonomy CSV import/export to put the taxonomy terms. 
Sample import file with terms&amp;hierarchy should look like this:

BMW;BMW 5; 

BMW;BMW 7; 

Audi;R8; 

Audi;A1; 

After you run these  imports, make the final node importer. 
Change the settings to node processor. Remember under Mapping for Node processor when you map taxonomy terms to have "Search taxonomy terms by: Term name" checked on these three columns