What you are trying to do is add additional information to each item in the list that you already created so
alist[ 'from form', 'stuff 2', 'stuff 3']
for j in range( 0,len[alist]):
temp= []
temp.append(alist[j]) # alist[0] is 'from form'
temp.append('t') # slot for first piece of data 't'
temp.append('-') # slot for second piece of data
blist.append(temp) # will be alist with 2 additional fields for extra stuff assocated with each item in alist