When do you want to travel ? I am assuming 10th (train that departs from. LTT) if yes then book 10th from LTT and change BP to PUNE (which means you will board the train that departs from LTT on 10th)
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To make it simple
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Book 10th (dep from LTT) board from PUNE on 11th early hours (will be train that departs from LTT on 10th)
Or
Book 11th (dep from LTT) board from PUNE on 12th early hours (will be train that departs from LTT on 11th)