@Bhaumik 

Did you notice this topic is ProConnect, not Lacerte? Did you follow the link previously given, to the Lacerte article for how this works? Here it is, again:

https://proconnect.intuit.com/community/federal-taxes/help/entering-a-vacation-home-for-schedule-e/0...

And here is what Intuit tells you there:

"For vacation home purposes, Lacerte calculates percentage of business use by dividing the number of days rented by the sum of the number of days rented plus the number of days of personal use. The program applies this percentage to all indirect expenses, including indirect mortgage interest and real estate taxes."