The phrase "added to the extent" is correct and usable in written English.
It can be used when discussing the degree or limit to which something has been added or included.
Example: "The budget has been increased, added to the extent that it now covers all necessary expenses."
Alternatives: "increased to the degree" or "expanded to the level".
She added, "To the extent that questions have come up, we have answered them".
He added, "To the extent that today's hearing restores it — by removing immediate threat of vacating a rule — it is a good day".
But he added: "To the extent that we think he is not being tough enough, I think you'll see Congress coming in and potentially doing something".
And, he added, "to the extent that these are for the benefit of the participants, I don't think you want to do that.
Oliver added: "To the extent the senator's letter is suggesting that there is no standard for a reconditioned and recertified helmet, that of course is clearly inaccurate.
But he added, "To the extent that this proposed law would ban the display of products to adult tobacco consumers, we believe it goes too far".
"We're putting this vote forward so we can turn the heat up back home," Mr. Santorum said, adding, "To the extent that we're playing politics, it's the politics of letting people back home know where their senator is when it comes to solving this problem".
He also noted "reports that they have moved a number of people from Iraq and Syria to Libya," adding, "to the extent that it's happening that's striking.
The value to the review of these three studies was in adding to the extent of evidence, rather than adding details about practices' structure and functioning.
Before flow cytometric analysis, 400 μl of 1× binding buffer were added to the cells and the extent of apoptosis was determined by analyzing 15,000 ungated cells using a FACScan flow cytometer and Cell Quest software (FACSCalibur; Becton-Dickinson, San Jose, CA).
Suitably massaged, the satellite data allowed an extra layer to be added to the digital atlas, showing the extent of the flooding.
