Go to Purchasing/Vendor Groups
Click "Add Group" and name your new Vendor Group
Click the "Vendors In Group" tab
Next to the Group Name field, click the magnifying glass and select the Vendor Group you created.
You will see there are no Vendors yet in the grid. Click the "Add Vendor" button and add the Vendor.
Go to the Data/Data Import-Export screen and select the Export tab
On "What to Export" choose "Inventory" and filter by "Vendor Group"
Choose the Vendor Group you created by clicing on the magnifying glass
and select the Export tab
Map the fields, Name the file, and Export