Help with Excel

[admin2019]

I am working on formulating an excel sheet and want to use rep codes to label certain rows and numbers. For example, 

205	G
305	G
405	M

I want to be able to have a formula that calculates the "G" total and then the "M" total on a different sheet. How am I able to do this? 

[#2 · Accepted solution]

For each rep code, just change the "G" in the following formula:

=SUMIF(B:B,"G",A:A)

[#3]

@PReagan How do I get it to Sum the total? When I do that formula it is not adding the numbers together.