The number of copies to be submitted is set down in the respective doctoral degree regulations of the University of Hohenheim. You can find these on the page Doctoral work at the University of Hohenheim.
The office for submitting the archival copies of dissertations is located in the Central Library, Garbenstr. 15, second floor, room 228 (telephone 0711/459-22094). The archival copies can also be handed in at the circulation desk of the Central Library during the usual opening hours or sent by post:
Universität Hohenheim - KIM (630)
Dissertationenstelle
Garbenstraße 15
70599 Stuttgart
You can find all information about the number of required copies for submission here.