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With all due respect @Stuart King, no this functionality does not currently exist. The idea seems quite clearly and simply expressed as saving .cub and .feeder files for a single cube as MULTIPLE files rather than a monolithic file. The main benefit would be during a data save that only the partitions which had changed would need their files updated. This would lead to significant time saving and reducing locking when saving large cubes.
This is clearly different from MTCubeLoad or MTFeeders.AtStartup. Yes these parameters boost performance during startup and they are a significant step forward. But they are very different from the main point of this proposed enhancement.
Changed status to already exists. This is effectively what MTCubeLoad already does. We do not plan to allow cube and feeder files to be split into multiple files. This change would conflict with the longer term plan for disk storage of the TM1 model objects.
I support this idea