Hi @Sam,
Splitting future reservations has long been a point of interest for us since we began using Mews, it seems strange that we can split an inhouse reservations but not a future.
Our CSM was able to provide this feedback early this year, It's on the long term roadmap and will be enabled by rate mixing which is currently under discovery. Not something that we'll be able to do in 2023, or the first half of 2024
I recently had a conversation with Matt, the CEO of Mews, about this issue. He pointed out that the main complication comes from channel reservations. Currently, these channels have the ability to recall and cancel bookings. If a future reservation is split into multiple parts, only the original booking would be affected in the event of a channel-initiated cancellation or modification.
Here is the Splitting Future Reservation feature request, it would be helpful to throw your vote on the request.