Technically a main and subreport don't execute at the same time, and subreports should be avoided, but yes, use the same criteria in each, and you can pass parameters from the main to the sub using the LINK.
You can also go in and manually edit the subreport record selection formula after linking if there's something amiss.
You should post what you're trying top do with an example of the main report record selection though, you question asks for a yes/no response, there's nothing specific.
-k