Creating Custom User Entities in HCM Extract

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Hi All,

Is there any option in HCM Extract for creating custom User Entities, where we can have our own query defined in a User Entity and use it to build an HCM Extract? 

Why I want to know this is, we have an Extract with around 7 to 8 User Entities, each User Entity has some 4 to 5 columns only that we require for our report and from some UE's we need only 1 column. By adding as many user entities, the performance of the Extract goes down a lot. 

So just a thought, is there a way that we could create Custom User Entities by defining our own Query or any other performance improving alternative suggestions, please let me know. We can't use BIP/OTBI as the Users need it to run as an HCM Extract only.