Adjust Rows to a different level than the Adjoining Column

[Dsturges]

I am making a table in Word. I have some rows that correlate to data in two separate rows. So I need to make a sort of "Half' row" or move it down a half a space.
I think the photo describes what I want to do.
It's basically - the data in Row two and Three correlate and I want them to be adjoined on a box the next column. The squiggly lines in my attached shows area that is not in use.
So 50 and 100 > to the data in the next column over (25).
Hopefully the picture explains it better.