You can ask a State Public Information Officer (PIO) to gather information from district PIOs, as the PIO of a public authority is responsible for providing information available with their authority, which may include information held by subordinate offices.
You should apply in writing to the State PIO, clearly specifying the information you need from the district offices, along with the prescribed application fee.
RTI act section 5(4) explicitly allows a Public Information Officer (PIO) to "seek the assistance of any other officer as he or she considers it necessary for the proper discharge of his or her duties
Section (5) reinforces the duty of the assisting officer, stating that they "shall render all assistance" to the PIO. Furthermore, for the purpose of contraventions under the Act, the assisting officer is also treated as a PIO.
The Delhi High Court, in the 2014 case of Ministry of Railways vs. Girish Mittal, observed that a PIO cannot function merely as a "post office" by forwarding an application to subordinates. The court emphasized that it is the PIO's job to collect information from units within their own organization by seeking assistance under Section 5(4)
You can conclude your application by stating your expectation that the information from all four district offices will be collated and provided to you as a single response within the statutory time limit of 30 days.
