wondering how big the warehouse space or type of storage structure you have which require 75 storage type . Could you please help us to with which type of industry you are operation and the physical/ operation process which leads to creation of 75 storage type
As far as solution to your query is concern " you can define a reference movement type in 319 and can define a separate storage type search against that reference movement type however in standard you have provision to define search upto 30 storage type so you need to revisit your enterprise structure definition.