SharePoint 2013 Variation :Propagate custom list programmatically

I have created a SharePoint portal in which I can create  sub sites programmatically up to two level . These sub sites also contains custom lists  which have created programmatically . Both of these sub sites also contains current navigation ( which contain different navigation link) created programmatically .Every thing is working fine but problem occurs when I implement variation   on my portal ,my source site perfectly propagated site content like web parts but did not propagate  custom  navigations  and custom list. how can I propagate my custom navigations and custom list.