Hi Expert's, How to Import Value in to Work flow???

I have Created a work flow which gets Triggered when cutomer Enquiry is Created. It Fetches the Cutomers Emails and sends them a Email Informing that Cuetomer Enquiry has been Created with the Status xxx.

For sending Emails i have created my own method in to the Business object ZBUS2030 which is a subobject of BUS2030.

My selection Query needs Enquiry Number i.e Sales Document Number (VBELN) to fetch Partners Email Id's.

Whenever The Enquiry s Approved from the respective Dept. Status will get Updated.

How can i Import this Value in to my Workflow?

How can i get Status Value, where it is Stored.?

Is it possible to Access it from Screen Fields??