Question regarding converting H1B from regular to premium processing

I am on L1 & my wife is on L2, currently at USA.

My new employer has filed my application for H1B petition and I have applied for my spouce's H4 (I539) 



I have received receipt number for H1B petition and H4. Currently it is under regular processing.



I would like to convert in premium processing.



First of all can I conevrt I539 in premium processing?



If yes, do I need to convert both and pay for both application for premium processing?  & what you will reccomend?

See if this helps: http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=4b7cdd1d5fd37210VgnVCM100000082ca60aRCRD&vgnextchannel=73566811264a3210VgnVCM100000b92ca60aRCRD