https://community.graphisoft.com/t5/Modeling/slab/m-p/153650#M82696 Select the floor and click on an edge or node.<BR /> The pet palette will appear.<BR /> Select the "subtract" option and then click the node for the hole that you want to cut.<BR /> Barry. Wed, 09 Jun 2010 06:29:09 GMT Barry Kelly 2010-06-09T06:29:09Z https://community.graphisoft.com/t5/Modeling/slab/m-p/153649#M82695 <DIV class="actalk-migrated-content"><T>the green shaded floor is 12" wood decking flooring using slab tool. this 'green' floor level is 12" below the red dashed line.<BR /> i need to create an opening at the stairs.</T></DIV><BR /><IMG src="http://community.graphisoft.com/t5/image/serverpage/image-id/73430iA7FEA2167A515D81/image-size/large?v=v2&amp;px=999" border="0" alt="Picture 1.png" title="Picture 1.png" /> Thu, 25 May 2023 14:53:17 GMT https://community.graphisoft.com/t5/Modeling/slab/m-p/153649#M82695 Llian 2023-05-25T14:53:17Z https://community.graphisoft.com/t5/Modeling/slab/m-p/153650#M82696 Select the floor and click on an edge or node.<BR /> The pet palette will appear.<BR /> Select the "subtract" option and then click the node for the hole that you want to cut.<BR /> Barry. Wed, 09 Jun 2010 06:29:09 GMT https://community.graphisoft.com/t5/Modeling/slab/m-p/153650#M82696 Barry Kelly 2010-06-09T06:29:09Z https://community.graphisoft.com/t5/Modeling/slab/m-p/153651#M82697 yes, i have done that ..thanks Wed, 09 Jun 2010 06:31:24 GMT https://community.graphisoft.com/t5/Modeling/slab/m-p/153651#M82697 Llian 2010-06-09T06:31:24Z