retrieve the value that is below of another cell

So I could not find the function that works opposite to Previous.

I want to retrieve the value that is below of another cell based on breaks/grouping.

For example:

Name          Amount          Value Below The Cell for each Name

Joseph          500               1000

Joseph          1000               1000

Joseph          1000

Alex               200               100

Alex               100

Kayla              750               2000

Kayla              2000              1150

Kayla              1150               500

Kayla               500