Not with SSI.However if you are planning to publish the site to a server with FP extensions you can use the Include page component which is broadly similar to SSI.
To do this just place your cursor where you want the include, click Insert>Component>Incude Page and browse to the page you want included.
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Katherine
InKK Design
LinKKs - Kilkenny's Online Magazine
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"Dogs have owners, cats have staff!"