Appending to Binary Contents in Power Query

I work with a complex simulation that measures events to the tenth of a second, in a two sided stochastic model, with scenarios that can last up to 360 hours, so I have sometime 1,000,000 plus rows in a .csv file.  Power Query easily imports the data and shows me a binary column with "content" that has the header and row info for the replication of the scenario game.  I normally run 33 replications.  It's easy to parse out the name of the case I am running and the replication {seed}, but I cannot figure out how to append this data to the "content"  / discrete rows of the binary column.  Can anyone help?