Need help only totaling specific headings

Here is an example of the data I receive for total time incurred for specifc delays during production. The issue I have is I only want to total specific headings and omit others. To complicate this further is if more codes are added the columns may not be the same the next time I generate the report. So how do I do this?

Codes Total for AB, TR, AS
AB TS IB TR AS VD VB
1.5 1.1 1.6 .9 1.8 4