Time to Go Column & Hiding duration for the summary line

Hi,

How can I add the column to show the remaining days for an activity to start? I assume it should be a formula Today's date minus the activity's start date. Please see the photo below;

1.png

Also, how can I hide the start/finish/duration columns' values for the summary lines? Please see photo below;

11.png

Thank you very much in advance.

Kind regards,

Yarkin