Proper term for colloquial Manglish "open order"

Solution 1:

The term that I thought of (having never seen this feature before) was group order. And it seems to be the term that’s actually in use:

A group order allows multiple people to add their individual items into a collective order cart at the same time. Once a Group Order is created through your DoorDash Account, the rest of your group doesn’t need to have a DoorDash Account to use the group order link. — DoorDash

Two ways to Group Order

• Group Order
  Administrators send out the restaurant choices, ordering link and manage the budget.
• Open Group Order
  Employees order together with a group of coworkers and use Split with coworkers at checkout to share the cost.

— Grubhub