Bulk create/update stock groups via csv

CSV Structure:

1. Column 1 (required – string): Name of Group
2. Column 2 (required – string): Product IDs/Variation IDs separated by semicolon(;). Make sure there are no space around the semicolons. The product id/variation id should match to product/variation id exactly.
3. Column 3 (required – integer): Stock for the group. This stock will be set for all products in group.
4. Column 4 (optional – integer): Group ID . You can skip this column if you want to create a group. If you want to update an existing group, then you will need to mention the group ID here. You Can get the group ID from listing of groups in your admin.