PSS-A  (Primary A)
PSS-B  (Primary B)
PSS-C  (Primary C)
PSS-D  (Primary D)
PSS-E  (Primary E)
PSS-F  (Primary F)
PSS-G  (Primary G)
PSS-H  (Primary H)
PSS-I  (Primary I)
SPARE  (SPARE)

1> PSS-A  (Primary A)
 2> PSS-B  (Primary B)
 3> PSS-C  (Primary C)
 4> PSS-D  (Primary D)
 5> PSS-E  (Primary E)
 6> PSS-F  (Primary F)
 7> PSS-G  (Primary G)
 8> PSS-H  (Primary H)
 9> PSS-I  (Primary I)
10> SPARE  (SPARE)

awk '{print NR  "> " $s}' inputfile > outputfile

cat -n inputfile > outputfile

nl -w2 -s'> ' file

1> PSS-A  (Primary A)
 2> PSS-B  (Primary B)
 3> PSS-C  (Primary C)
 4> PSS-D  (Primary D)
 5> PSS-E  (Primary E)
 6> PSS-F  (Primary F)
 7> PSS-G  (Primary G)
 8> PSS-H  (Primary H)
 9> PSS-I  (Primary I)
10> SPARE  (SPARE)