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You can consolidate multiple Meta files into one using consolidate functionality. This is assuming that the schema of all files in the meta-model folder is the same.
What if there is Parent-child relationship in your data module?
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You need to update the field (through which you are planning to make a join with the parent entity) of your child entity in meta model by updating the “Entity Attribute Compare Key Role“ to “Yes”, “Entity Attribute Parent Lookup Key Role“ to “Yes” and in “Entity Attribute Parent Lookup Location“ you need to give the FDL/Stage location of your parent entity. Please refer above screenshot, where “movies” is the parent entity and “roles” is the child entity.