Sum up specific entries of an array under condition in VBA

I have an issue with summing up specific entries of an array in VBA. I give you an example of how my matrix looks like (let's call the matrix "startMatrix")

Date      ticker      value
2005.01   200         1000
2005.01   300         2222
2005.01   400         2000
2005.02   200         1100
2005.02   300         3000
2005.02   400         5555

In VBA the matrix is then read in like this:

startMatrix(1,1) = 2005.01
startMatrix(1,2) = 200
startMatrix(1,3) = 1000
startMatrix(2,1) = 2005.01
startMatrix(2,2) = 300
....
startMatrix(6,3) = 5555

So I would like to sum up the value for each date if the ticker is either 200 or 300 and save this new array (let's call it finalMatrix). The finalMatrix should look like this then:

Date      Value
2005.01   3222
2005.02   4100

The finalMatrix should look like this in VBA at the end:

finalMatrix(1,1) = 2005.01
finalMatrix(1,2) = 3222
finalMatrix(2,1) = 2005.01
finalMatrix(2,2) = 4100

I am not very used to these kind of operations so I would really, really appreciate your help. Thank you in advance and have a nice day Elio