From what you are describing, this is a very easy process and can be done in only a few short hours.
From what I understand, you want:
200 Excel Sheets (in 1 book)
Each sheet has 100,000 unique (10-digit) numbers
How should the numbers be formatted on each sheet? Should they all be in one column, one row, or multiple columns and rows?
Should the numbers ALL be unique (accross multiple sheets) or should the numbers of each sheet be unique?
Whatever it is, I can do it with some simple programming.
If you would like to discuss more details, feel free to contact me anytime.
EDIT:
So I decided that I would program this up. So if you would like to see a quick sample, be sure to contact me and I can send you it.