i am looking for some advise i am trying to cut letters with my laser i do all the design work in corel 13 and then export it to autocad and then to the laser but i end up with parts missing or incorrect information can anyone help

What machine do you use?
i use corel, then export it to AI.
after that run on my laser.

the other way, you could run laser from corel.

try to export to .plt file
this is text file that can reduce version diferences.
Corel is not a best program to make dxf file.
good luck

Export it as .plt. the lasercut or dsp software will open it. you dont have to export it to autocad, you only use one cad and then to the machine soft.