
The 'p' dynamic in the tenor and not the bass is not unreasonable - it is just setting the dynamic to match the alto (which happens in the next bar), and probably the sop which I guess happens in a following bar we can't see.

I think I'd use a slur.ms object to get the appearance while, otherwise a tie would stop the top voice from sounding the beat 3 'C' and a slur would interfere with the appearance of the later slur. The tie between the minim 'C' and the following crotchet 'C' looks ambiguous - it could be a slur or it could be a tie. Now enter the rest of the notes as per normal.select the rest across it then reposition it vertically.place the rest for the value, then for the rest.place the minim C by setting the value and then the note.place the crotchet C and set the stem UP.The offset rest is for the top voice only to give a correct beat count for that voice, it is ignored by the bottom voice. There are only 4 beats in this bar, the crotchet (quarter note) 'C' in the "top" voice is in a chord with the minim (half note) 'C' in the "bottom" voice. Don't know for sure and further context may help, but it doesn't really matter from the point of view of getting the writing to work.

I'm not certain what the writers intentions actually are, but the split voicing in the basses may be either an expectation that the basses will have some sing one part and others the other part, OR perhaps it is an alternative for a second time through.
