Refer to To Prepare to Install a Solaris Flash Archive With a Custom JumpStart Installation in Solaris 10 11/06 Installation Guide: Custom JumpStart and Advanced Installations.
The procedure to install the OTP flash archive using jumpstart is the same as using a standard flash archive process except that you need to copy the OTP flash archive (otp_sparc.flarc or otp_x64.flarc) from the bootable DVD.