How to: Bulk-Load Data into Tables in a Merge Publication (Replication Transact-SQL Programming)
When data is loaded into tables using the bcp Utility or the BULK INSERT command, by default, the merge replication triggers that maintain tracking data in the MSmerge_contents system table are not fired. You can either force the merge replication triggers to fire as the data is loaded, or you can insert the generated replication metadata programmatically after the bulk copy operation using replication stored procedures.
To bulk-load data into tables published by merge replication using the bcp utility
Use one of the following methods to ensure that replication metadata is generated for the inserted data.
Execute the bulk copy using the FIRE_TRIGGERS option.
On the database into which data was inserted, execute sp_addtabletocontents (Transact-SQL). Specify the table name into which the data was inserted for @table_name.