Merges your current fluid effect’s enabled caches and disables the cache nodes that are merged. By default, this operation does not delete any of your fluids cache nodes.
Fluids nCache > Merge Caches > 
Opens the Merge Fluid Cache Options window. This window lets you specify the name, type, and location-on-disk of the merged fluid cache.
The Merge Fluid Cache Options window provides the same settings as the Create Fluid Cache Options window. See Fluid nCache > Create New Cache.