How to measure voltage of three different batteries

[BlueG]

Hello, I have a LK 3.5 and three questions. Maybe it is easy for you, but I am newbie

Question #1
I want to measure the voltage of three different batteries (2x voltage up to 4V, 1x voltage up to 60V).
I have connected one battery to GND and INPA1 (connection to INPA1 is protected by small fuse). It works very well.
I am not sure How to connect additional bateries as there are no separate GND for other sensors and I do not want to interconnect batteries.

Question #2
I want to measure the DC current on four cables (4x DC current up to 60A) with wcs1800 sensor.
Is it possible to increase a range from 35A to 60A ? 

Question #3
I need to use 3 analog inputs for voltage and 4 analog inputs for current. Is it possible to extend number of analog inputs ?

Thank you for your time