Show premiums paid by company as taxable benefit on T4

SUGGESTED

I don't know how to set up premiums paid by the company as a taxable benefit on the T4.  Also, should this show up on each pay or will it only show up on T4 at end of year?  Final question is how to do a year to date amount first and then add regularly going forward - our year end is December 31st but we haven't set it up yet.