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try:
awk '{a[$1]=$0" "a[$1]}; END {for (i in a) print a[i]}' sample.txt

This should work:

awk ' BEGIN { sorting=0 }
/^#/ { if (sorting) {
close("sort")
sorting=0
}
print
next
}...

To the test file you have posted above, try something like..
sed '/ARS (11)/!s/.*/SOME TEXT HERE\n&/' test_file
Note: This would not work for all scenarios until there is a exact sample input/test...

Test file:

$ cat test
paul, Paul Smith, Stevn Smiley, REQ000001, ARS (11)
sam, Sam Martin, Stevn Smiley, REQ000001, ARS (11)
mike, Mike Conway, Stevn Smiley, REQ000001, ARS (11)
mike, Mike...