Changing linetype in VLISP by operating on DXF entity list

[JamesClayHall]

I wanted a few buttons that would allow me to pick a group of entities and change the linetype only. I cannot seem to access the extended list that contains the dotted pair for linetype (6."linetype"). How does one cdr and entmod these variables in LISP?

 

[Paul Turvill]

What have you tried? Group 6 is optional, and won't show if the linetype is bylayer. In that case, you can append the appropriate Group 6 to the entity list before (entmod). Note that the correct syntax is (6 . "linetype") -- with spaces surrounding the ".".
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I wanted a few buttons that would allow me to pick a group of entities and

change the linetype only. I cannot seem to access the extended list that contains the dotted pair for linetype (6."linetype"). How does one cdr and entmod these variables in LISP?