Importing Rules with Gantt from MS Project

Hi there!

I imported my gantt from MS Project straight into Smartsheet but the end dates seem to be off by quite a bit, it isn't copying exactly in as I need it to. I then realised that have some rules in my MS Project that may not have carried over to my sheet. 

So currently in my MS Project gantt I have rules applied for dates so that they include our work holidays and annual holidays. How to I get those to carry over to smartsheet?