How do I create the organization structure of an importing, selling and distribution pharmasceutical company?

The company is in africa and imports pharmasceutical supplies from all over the world and also buys locally. Has a head office, and 5 branches, 20 sales agents and 20 warehouses and 6 depots. I need to create an organization structure, with proper placement, and titles of the employees

Try using a hierarchical chart.

sounds like a homework question

The details are not enough. But let me make an attempt.
The structure starts with Head office at the top level with 5 branches in level 2, 4 warehouses under each branch at level 3, and 6 depots one each for each branch and one from the head office all depots at level 3.
As depots are the interfaces to the customer, the sales people need to be distributed over the depots.
For each branch, you can have a branch manager, sales manager and accounts officer and an admin manager.
In the warehouse you will have one incharge, store keeper, security officer and inspection officer.
Hope this can help you.