https://forums.autodesk.com/t5/autocad-forum/problem-when-subtracting/m-p/10130238#M83665 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="image.jpg" style="width: 4032px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/888722iA3FC4B8C2700F0F9/image-size/medium?v=v2&amp;px=400" role="button" title="image.jpg" alt="image.jpg" /></span></P><P> Hi! I struggle with this problem. I am trying to make windows and when i subtract the boxes it subtract it only from one side. The box is bigger than the wall and i can see the lines on both sides. Any help please?</P> Thu, 04 Mar 2021 15:04:13 GMT liinanotko 2021-03-04T15:04:13Z https://forums.autodesk.com/t5/autocad-forum/problem-when-subtracting/m-p/10130238#M83665 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="image.jpg" style="width: 4032px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/888722iA3FC4B8C2700F0F9/image-size/medium?v=v2&amp;px=400" role="button" title="image.jpg" alt="image.jpg" /></span></P><P> Hi! I struggle with this problem. I am trying to make windows and when i subtract the boxes it subtract it only from one side. The box is bigger than the wall and i can see the lines on both sides. Any help please?</P> Thu, 04 Mar 2021 15:04:13 GMT https://forums.autodesk.com/t5/autocad-forum/problem-when-subtracting/m-p/10130238#M83665 liinanotko 2021-03-04T15:04:13Z https://forums.autodesk.com/t5/autocad-forum/problem-when-subtracting/m-p/10130363#M83666 <P>If the "sides" you speak of are separate 3D Solids, and the wall is not monolithic, did you select <EM>both</EM> of them [or <EM>all</EM> of them if more than two parts make up the wall] at the "<FONT color="#000000">Select solids, surfaces, and regions to subtract from ..</FONT>" prompt(s)?</P> Thu, 04 Mar 2021 15:59:45 GMT https://forums.autodesk.com/t5/autocad-forum/problem-when-subtracting/m-p/10130363#M83666 Kent1Cooper 2021-03-04T15:59:45Z https://forums.autodesk.com/t5/autocad-forum/problem-when-subtracting/m-p/10130364#M83667 <P>Hey, yes I selected both sides.&nbsp;</P> Thu, 04 Mar 2021 15:31:50 GMT https://forums.autodesk.com/t5/autocad-forum/problem-when-subtracting/m-p/10130364#M83667 liinanotko 2021-03-04T15:31:50Z https://forums.autodesk.com/t5/autocad-forum/problem-when-subtracting/m-p/10130497#M83668 <P>When using subtract it is good practice, when feasible, to have the solid that is going to be subtracted to fully penetrate the solid that is to remain.&nbsp; That is, make sure the box you are subtracting is not flush with the wall but passes through it.</P> Thu, 04 Mar 2021 16:03:55 GMT https://forums.autodesk.com/t5/autocad-forum/problem-when-subtracting/m-p/10130497#M83668 leeminardi 2021-03-04T16:03:55Z