Grouping and selecting symbology category data on ArcGIS

I have data and I categorized this data in symbology (ArcGIS 10.6.1). There is so many categories because of so many attribute table text.

How do I select just color parts on legend and how can I auto-group this data?

For example; 01:10; 2 – 01:10; 3 – 01:10; 5 => 01:10; 2-3-5.