When creating assignments, you can send multiple assignments to the same Gradebook entry ("Associate with existing Gradebook entry").This feature worked well in 2.7 but with 2.8 onwards this is not the same. The previously created column is grayed out and not available to be reassigned.
It will be great to have this feature wherein and existing Gradebook column 1 can be Associated to Assignment1a, Assignment1b, Assignment1c etc. Basically several assignments can point to same gradebook column. Please let me know if you need any additional clarification. We have several faculty who have been using this prior to our upgrade.