Question for a DM

Do you think it is ok to ask a DM for something for your character?

I am in a weekly campaign as a level 6 wizard and have just bought an enduring spellbook.

This is what i am thinking of asking him.

I was wondering if there is a way i could transcribe spells from my current spellbook (not from any other source) to the enduring spell book for less money, even if it consumes the spells from my old spellbook to do it.

You should always feel comfortable asking your DM any questions you might have about the game, including questions of this nature.  For the most part, the worst they can do is say "no", in which case you are not really out anything by asking.  And, if they are the kind of DM who does something worse than say "no" (such as belittling you for asking the question), they are probably not worth playing with in the first place. 

The rules already allow for this, for the Wizard class:

Replacing the Book. You can copy a spell from your own spellbook into another book—for example, if you want to make a backup copy of your spellbook. This is just like copying a new spell into your spellbook, but faster and easier, since you understand your own notation and already know how to cast the spell. You need spend only 1 hour and 10 gp for each level of the copied spell.

Thank you that is want i wanted to do in the first place.

and now i feel dumb for not re-reading the spellbook section first :)