How to create a data checker/ reviewer role

I need to collect data from various regional offices (say 10) which report to one Central office. Data collected from these regional offices will then be consolidated at one place and analysed. So, I have created a Data Collection Project at the central office level and assigned the role of project manager to one person (or more). Now, people at regional offices have been assigned data collector roles. However, the need is that one person (say reviewer) needs to check the data for error at regional level. Once satisfied with the correctness of data, the data is submitted to the Central office. How can I achieve this functionality?

I should not make projects for each regional office because there are so many regional offices (say 100). Also there around 10 forms for one Project. So, if I make changes in one form, I need to replicate the same changes 100 times (once for each regional office)