For data capture using NOW, the following columns are mandatory in the watchlist.
To setup column profile for a watch, right click on the watchlist header and select "Reposition Columns" menu in the popup menu displayed.
Ensure the above columns are available in the right hand box of the column profile displayed. These columns have been marked with red box in the picture.
The above columns are mandatory but a watch can have more columns.
Make sure to save the column profile and use is subsequently
Follow the below picture to capture the RT data from NOW.
To watch symbols from multiple watches, select them one be one and click on "Start RT Data Capture".