How to delete a company in MS Dynamics GP

You have to delete the company in GP first then from the database from SQL.

Steps: 
1. MS Dynamics GP Menu>>Tools>>Utilities>>System>>Delete Company.
2. Enter the system password if necessary.
3. Open the lookup then select the company that you want to delete.

by this you just deleted the company from GP only

4. Open the SQL management studio.
5. Open the databases.
6. Right click on the database you want to remove and click delete.