You need to have different vias for that... create the vias with the solder mask you need and then place the vias you need in the proper place in the design. -----Original Message----- From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of Eileen Ong Sent: Wednesday, December 13, 2006 5:09 PM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Solder mask layer definition Hi, Help will be very much appreciated; trying to figure before I release the Gerber. I'm trying to set up the bottom solder mask in the artwork setting. I have a standard via that are defined as test via on some locations. How do I set up the artwork solder mask layer such that for test via, the solder mask is open and non test via the solder mask is close. Thanks in advance. Best regards, Eileen