To add followers in bulk into your Pipedrive account:
- Add the ID column to the List View of your Deals tab and export out the list to Excel as shown here.
- In Excel, add a column for Deal/Person/Organization followers and include all the users you wish to add as a follower, separating each user's name with a comma.
- Import that Excel file back into Pipedrive like explained here, and specifically match the ID field.
- While mapping the import, use the Deal/Person/Organization Follower field on the left side and map it to the Follower column within your spreadsheet.