Init to deltas

hello,

Suppose i have inits scheduled for 01.01.2004 to 12.07.2005(doc.date) for purchasing datasources.

When the inits are successful(after the setup run in r/3 with no selection condition). i will schedule delta on a daily basis.

Will this delta also pull in records for dates from 12.07.2005 onwards?

What do i need to do to include data till current date when the delta's are running fine with above selections?(both on r/3 & bw side?)

Can someone give a detail procedure for the same.

regards,