maybe you could try to create a new calculated dimension and get only the last 8 characters?
Otherwise have you tried to select the Time transaction dimension, right click, and specify that is a date dimension? This way you will automatically have different level of date/time aggregation.
Hope it will help you
If I create new calculated dimension and get only the last 8 characters then will be 02/01/1900 4:09:35 = 4:09:35, I need have 52:09:35.
If I specify that is a date dimension, will be
Year Country Hour of Time transaction Minute of Time transaction Second of Time transaction
2013 PL 4 09 35
Year Country Time transaction
2013 PL 52:09:35