Sometimes for better clarity and good organization, you may wish to connect one sitemap to another sub-set of sitemaps.
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The is easy to do (with the Editing Pro feature)

step 1: Create a New Child Page from the Sitemap you wish to link from.
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Step 2: Edit the Page

Step 3: Enter the Sitemap's Name

Step 4: Upload a screenshot from the 2nd sitemap > Main Page
*Note: you can get this from here.
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Step 5: Open the second sitemap and Copy the Shared Map Link into your Clipboard

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Step 6: Paste this link into the new page you created:
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Done!