How to cut on/off Power supply of an IC?

[q12]

Im trying to cascade 2x4017 and i want to obtain the same functionality as it was a single IC.
When they are cascading, the functionality changes.
The solution is to cut the power off when is not used.
I looked into ProteusVSMSDK.pdf and from there I could find other possible power changes so I changed my 4017 properties as:
{PACKAGE=DIL16}
{MODFILE=4017}
{VOLTAGE=0.1V} //to cut it off
{ITFMOD=MMOS} // other power solution
But... nothing works.
Again, I dont want to modify the TTL default power supply, I only want my chips to be cut off from my circuit logic.
Thank you.

[Ettore]

Please attach the Proteus project file here (the file with extention pdsprj), so that we can see what you're attempting to do.
Without it we cannot help you.