Need to combine 2 rows of data into one line while summing their contents

Basically, we have 2 tablets tallying data and writing to the same .csv file. That csv file is then copied into a front page of a much larger excel worksheet where the tallied data is sorted and used for a variety of reasons. This works perfectly using index and match when only 1 tablet is being used, however, when both tablets are writing to the same csv at the same time it creates 2 lines instead of 1 line.

For example 1 tablet might look like this:

Lot 45689 4 6 8 9 1 5

2 tablets looks like this:

Lot 45689 2 3 1 8 1 4
Lot 45689 2 3 7 1 0 1


for the tallies, i would imagine a =SUMIF function might suffice, but that doesn't solve my problem of there being 2 lines with the same lot #.

I am only dealing with this issue from the excel side, and have no control over the tablet functionality or the CSV file which further limits me.

Any help would be greatly appreciated. Thanks!

Wanted to add that the Lot #s change daily and often so with my understanding of pivot tables this rules them out as a viable option.