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For fixed-length records, the sum of the lengths of all control fields cannot exceed 32752 bytes. When EQUALS is in effect, the sum of their lengths cannot exceed 4088 bytes.
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For variable-length records, all control fields must be located within the first 32750 bytes and the sum of their lengths cannot exceed 4084 bytes. When EQUALS is in effect, all control fields must be located within the first 32746 bytes and the sum of their lengths cannot exceed 4080 bytes.
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Control fields can be in contiguous or non-contiguous locations in the record.
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Remember that for variable-length records, the first 4 bytes are reserved for the Record Descriptor Word, so the first byte of the data portion of the record is byte 5.
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If the output file is a key-sequenced VSAM cluster, the VSAM key must be the first control field specified.