hi someone:

i use region cammand in draftsight ,but i can't use it complete my purpose.i want use it union(intersect or subtract) some entity like on autoCAD,what should i do?

thank a lot.

ps: i don't know what i expression i want it or not.please view the picture. 

pps:i work on the windows 7. the RAM is 1 GB,the version is draftsight 2016 SP2.