How to import purchase orders with different document style when importing through PDOI.

Hi

I have a requirement where in i have created multiple document style as per clients requirement and each document style has a different approval flow .

Now i have a set of POs to be imported but with specific document style so that , we trigger that particular approval flow.

I have another question that is
 If we are using the requisition import we can initiate the approval process as soon as the requisitions are created in the incomplete status.
Can the same feature be possible with using PDOI.

With Regards
Uday Raju