Visual Composer and workflow

Hi,

We have a requirement to work on Visual Composer with Workflow and File upload and download in VC.

I just want to know

1.How can we integrate workflow with Visual Composer?

2. How can we import and export data from Excel,PDF?

I already refered the blogs,there they export the data with "export " system action,and paste the data in the excel sheet.But my requirement is to export the data into Excel sheet without using the paste option.

Can any one guide me to acheive this.

Regards

Nandha.