You can add tags to your keywords and filter/sort them by those tags. To do it:
go to Rank Tracker section:

select the keyword you want to add a tag to and click on the "Tags" button:

Clink on the "Add tags" from the dropdown menu:

You can also filter your keywords by tags.
Click the New filter:

Select "Tags" from the drop-down menu:

Then select the tag you want to filter for:

go to Rank Tracker section:

select the keyword you want to add a tag to and click on the "Tags" button:

Clink on the "Add tags" from the dropdown menu:

You can also filter your keywords by tags.
Click the New filter:

Select "Tags" from the drop-down menu:

Then select the tag you want to filter for:

Updated on: 24 / 08 / 2019