On Ty2 you can preset a Portamento time value on a voice part in the Mixing Console. On a normal voice that won't immediately become active, but if you press the mono button you start getting the Portamento effect. Put mono back to Poly and PM stops.
You can also inhibit the PM from being applied - even if mono is set - by playing true staccato.

A further refinement is to assign a pedal to Portamento. Now even if the voice is set to mono the PM will only occur if the pedal is pressed. Presumably so you can play in Mono without skidding all over the place and only apply the PM to the intervals that you choose.
John