If you are shooting at a convoy (all ships with same speed and course) with low gyro angle (targets near your bow), the firing solution for one target is good for all others, you must simply point and shoot. If shooting with somewhat larger gyro angle, you must only calculate the range of each target (with notepad), other settings remain the same.
Have a look at this page
http://www.paulwasserman.net/SHIII/
about how to set the TDC for multiple shots in a convoy
Maraz