Hi Thomas,
Thanks for your reply & it was very helpful.I was able to import the excel files using Open option.In the excel I added three columns Source ,target & type.In type ,I used to update type of process map .After clicking on OK button,It does display flowchart :)
But there are two challenges
1.In properties mapper I am only able to get two steps which can get converted to decision box,However I have more than 4 steps which need to be converted to decision map..Require your help in converting all the required steps in decision box
2.How do i import steps mentioned in the excel into swim lane of Yed graph editor