You can do this using just about any method of replication. Transactional as well as merge will work in both a connected and disconnected manner, as long as you do not have conflicts occuring between sites. The number of transactions does not matter either. As long as you are partitioning the tables based on the site, then you can handle moving the rows to where they belong. The biggest challenge is going to be in desiging your paritions such that your data is logically split. If you are moving data via static partitions, transactional would be a better choice. If you are dynamically splitting the data or you are partitioning multiple tables based upon a "master" table, then merge would be a better choice.
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