Blocking internet access (R6400)

[KJBJ]

Can I use the R6400 Netgear router to block a home network W10 computer from accessing the internet while maintaining network connectivity?

[antinode]

> [...] block a home network W10 computer from accessing the internet
> while maintaining network connectivity?

   I'll bite.  What, exactly, does "network connectivity" mean to you,
and how, exactly, does it differ from "accessing the internet"?

"connectivity" between what and what?

   What, exactly, would you like to "block", and what, exactly, would
you like to allow?