stop users to sharing in two diffrenet Workgroups on a lan Network, what should i do ?

[Ronak4ever]

Hi,
I have 30 computers connected to Workgroup-based (small office network) lan network. NO SERVER ARE INSTALL I HAVE TWO 16 PORT SWITCH.
these computers divided into 4 workgroups.
Only Internet Connection must be shared between these 4 workgroups and I WANT TO MUST STOP SHARING IN DIFFERENT WORKGROUP

FOR EX. ONE WORKGROUP NAME IS ABC AND IT HAS 5 PC AND OTHER WORKGROUP NAME IS XYZ AND IT HAS 7 PC I JUST WANT THAT ABC AND XYZ ARE NOT COMMUNICATE EACH OTHER AND NOT EVEN SHARING AND NOT SEE IN NETWORK PLACE.
.
SHOULD I CHANGE ALL PC SUBNET ? PLS HELP.
please help me How setup this network and how must set permissions for each workgroup?

Thanks in advance.

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