How to enable connecting floating input pins to constants?

Hi, there:

My ASIC library doesn't allow 1) input pins of any cells left unconnected,

Though 2nd appear quite abscure, since these multiple input pins waste too many vdd/gnd cells.

My library has special tie-high/low cells to cater these circumstances, but what are the constants in Design Compiler that I can set in order to comply with these two rules?

Thanks