Can't select chimney for resizing

[McHaney]

I have HD Pro 2021.  I've placed Stone Fireplace #4 (label 723097) on an outdoor patio.  Now I need to extend the chimney upward through the roof.  I've read everything in the Reference Manual (page 385) and I've searched this User Forum for "chimney".  I cannot select the chimney for resizing as described on page 385.  The fireplace does not have edit handles on the edges -- only the center handle for moving the entire fireplace.  I have opened the fireplace object (Architectural Block Specification Dialog) to edit the Size/Position manually.  When I change Floor to Top, Floor to Bottom changes to maintain a constant 97-1/8" height.  When I change Floor to Bottom, Floor to Top changes to maintain a constant 97-1/8" height.  I can't find any way to make the chimney taller.

 

What am I doing wrong?  Why can't I change the height of the chimney?

 

 

[solver]

13 minutes ago, McHaney said:

Now I need to extend the chimney upward through the roof.

 

Did not look in the reference manual, but that for that symbol, you cannot change the shape of individual parts.

 

If you need something different, you will need to model it yourself from individual parts.