This has to do with the mold design option, I think those topics belong in parametric > manufacturing.
Link to post:
(Did You Know? Filling Loops on a Part Mold)
by cmcclintock
https://community.ptc.com/t5/Part-Modeling/Did-You-Know-Filling-Loops-on-a-Part-Mold/m-p/444351#M9056
<html><head></head><body><p><span style="line-height: 1.5em; font-size: 12pt;">If you’re working with a reference part in mold assembly that contains holes, you need to cap them before you split the mold. </span></p><p><span style="font-size: 12pt;">In this post, a PTC expert describes how to cap the holes in Creo 3.0.</span></p><p></p><p><span style="font-size: 12pt;"><span style="line-height: 1.5em;"><em>First, hide the workpiece so you can collect surfaces on the reference part efficiently. To do this, in the Model Tree, right-click the workpiece and from the pop-up menu, </em></span><span style="line-height: 1.5em;"><em>click <strong>Hide</strong></em></span></span><span style="font-size: 10pt; line-height: 1.5em;"><em><span style="font-size: 12pt;">.</span> </em></span></p><p><em> <img __jive_id="106217" alt="hide-option.png" class="jive-image image-1" src="https://community.ptc.com/legacyfs/online/106217_hide-option.png" style="height: auto; display: block; margin-left: auto; margin-right: auto;" /></em></p><p><em><br /></em></p><p><em style="font-size: 12pt;">Next, on the reference part, locate the holes that need to be capped.</em></p><p><em><br /></em></p><p><em><img __jive_id="106218" alt="holes-to-be-capped.png" class="jive-image image-2" src="https://community.ptc.com/legacyfs/online/106218_holes-to-be-capped.png" style="height: 371px; width: 620px; display: block; margin-left: auto; margin-right: auto;" /></em></p><p style="text-align: center;">Image: The holes within the red circles need to be capped in order to split the mold.</p><p><em><br /></em></p><p><em style="font-size: 12pt;">On the <strong>Parting Surface</strong> tab, click <strong>Shut Off</strong>. Then select individual surfaces around the hole(s).</em></p><p><em><br /></em></p><p><img __jive_id="106219" alt="selected-surfaces.png" class="jive-image image-3" src="https://community.ptc.com/legacyfs/online/106219_selected-surfaces.png" style="height: 389px; width: 620px; display: block; margin-left: auto; margin-right: auto;" /></p><p style="text-align: center;"><em>Image: Select the surfaces around the hole.</em></p><p><em><br /></em></p><p><em style="font-size: 12pt;">On the <strong>Shut Off</strong> menu bar, select the <strong>Close all internal loops </strong>check box. Then, click OK (check mark) to apply the changes.</em></p><p><em><br /></em></p><p><img __jive_id="106220" alt="capped-holes.png" class="image-4 jive-image" src="https://community.ptc.com/legacyfs/online/106220_capped-holes.png" style="height: 397px; width: 620px; display: block; margin-left: auto; margin-right: auto;" /></p><p style="text-align: center;">Image: The holes are now capped (shown in orange).</p><p></p><p></p><p><span style="font-size: 12pt;">To watch a demonstration of these steps, check out the <a href="http://learningexchange.ptc.com/tutorial/4739/parting-surface-shut-off" target="_blank">video tutorial (“Parting surface – Shut Off”)</a> on the PTC University Learning Exchange.</span></p><p></p><p><span style="font-size: 12pt;">Stay tuned to our “<strong>Did You Know</strong>” blog series as we cover all of the exciting, new enhancements in PTC Creo 3.0.</span></p><p><span style="font-size: 12pt;">Have some ideas about what PTC Creo product features you’d like to learn more about? Send me a message or leave a comment below and we’ll write up the best ideas from the community. Thanks for reading, looking forward to all of your feedback!</span></p></body></html>
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Doug Schaefer | Experienced Mechanical Design Engineer
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