Connect reservations without merging into group
If the channel manager has made reservations (and therefore it's not possible for the rest of us to merge groups), or if we have several bookings from different backgrounds and do not wish to mix their billings, it would be great to connect the reservations somehow. In stead of group, call it "related" or similar.

Hello from the Mews product team.
Unfortunately, this request has not received the necessary upvotes to be added to the Mews development roadmap and is unlikely to be delivered.
Thank you for sharing your suggestions.
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labrique.nicolas commented
Mews allows to merge reservations but in the case a guest extend his stay through OTA's , even if you merge reservations, reports will show that room both in arrivals and departures. If the night Audit and Housekeeping don't pay attention , we ask the guest to release the room whereas his stay continues. In that specific case, that would be great if Mews shown that room as "Stay Over" in the report.