Webpage not Webtop with sso

No, I don't believe so. APM will have no knowledge of each resource behind an externally hosted link.

The whole point of having SSO on a per-portal resource basis is that each resource can have different SSO requirements, HTTP Basic, SAML, Kerberos etc. Once you've left APM and arrived on a 3rd Party page there is no way to pass SSO credentials to each resource linked on that page.