its the total carbs, the bit that says of which sugars relates to how fast that content of the carbs digests therefore releases the glucose into your system but carbs are carbs, some people find they can tolerate carbs better in the morning or start of there day in your case than at the end of there day or nightime but you will have to experiment with your meter to know
and yes you can save carbs imo, i used to if i wanted a certain meal think to myself, ill eat fewer carb for brekkie so i can eat that at dinner time for example