Dado
$ cat > file.csv
"Product ID";"Product Name";"Price";"Description";
"11;"Example";"200";"Descripcion here...";
"21;"Example2";"300";"Some here...";
então
$ awk -F';' 'NR>1 {print "{" $0 "}" > substr($1,2) ".csv"}' file.csv
resulta em
$ head ??.csv
==> 11.csv <==
{"11;"Example";"200";"Descripcion here...";}
==> 21.csv <==
{"21;"Example2";"300";"Some here...";}