Yes, you can use subscript in MATLAB timetable class, similar to subscript in a MATRIX. For example to get the first half of the timetable you can use subscript like this
The exact detail of which subscript to use depends on the values you want to extract.
Edit: the updated answer according to your dataset is
TT_hours = hour(TT.Time);
index = d_hours <= 10 & d_hours >= 8;
TT_new = TT(index,:)
This will extract rows in which the hour is between 8 and 10.