Best way to transfer a few tables from reserve server to production

We have two MS SQL Servers (2012 Standard Edition on Windows 2012 Server) which are located in the same subnet. One is **production** server. Another is **reserve** server. Currently there is a transactional replication between two databases on these servers where **production** server is Publisher and Distributor and **reserve** server is Subscriber. On **production** server every night runs some tasks which inserts to (or updates) about of 5 tables one of them is about 6 Gb. We would like to move this tasks to **reserve** server and create on one another database with the same scheme. Then when tasks upload data to another database we need to synchronize one with **production** database on **production** server. **One moment :** For supporting actual data we must to include another database on **reserve** in replication as Subscriber from **production** server. As one way we consider linked server: 1. Truncate table on production (in one table there is FKs, so we can't) 2. Insert data from another database **Edit:** How about linked server and merge functionality? How do you think are there the better way?