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awk -F\| ' NR==1 {
printf "%s", $0;
p = $1;
} p == $1 {
printf ",%s", $2;
} p != $1 {
printf "\n%s", $0;
} {
p = $1;
} END {
printf "\n";
}'...

Like so?
awk 'p!=$1{if(p)print s; s=$1 "|" $2; p=$1; next}{s=s "," $2} END{print s}' infile

awk ' {Ar[$1] = Ar[$1](Ar[$1]?",":"")$2}
END {for (i in Ar) print i, Ar[i]}
' file
BUD,BDL BUDCAR,BUDLAMP
JKL,HNM,KTY,KJY JAGAN,HOUSE,KATAK,KOLKA
ABC,CDF,KLT...

If you want to remove space anywhere in the file.

sed 's/[ ]//g' file

awk -F, '{print $0,$1 RS $0,$2}' file