Concatenate files

I have directory structure sales_only under which i have multiple directories for each dealer

example:
../../../Sales_Only/xxx_Dealer
../../../Sales_Only/yyy_Dealer
../../../Sales_Only/zzz_Dealer

Every day i have one file produce under each directory when the process runs.
The requirement i have is to concatenate each of the dealer file records into another file at the Sales_Only level and do a combined record set of the individual file.

How do i achieve this?

Thanks in advance.

ls -1 ../../../Sales_Only/*_Dealer/* | xargs -i cat {} >>../../../Sales_Only/all_Dealer.txt

cat ../../../Sales_Only/*_Dealer/* >> ../../../Sales_Only/Alldealers.dat

@Scruti :

Lol : OMG i missed that one