"internal negotiation" is correct and usable in written English.
You could use it to describe the process of discussion and compromise between two or more people within a certain organization or group. For example, "The internal negotiation between the marketing and sales departments took weeks before they reached an agreement."
But despite their support, the project was not going to happen without a lot of hard work and internal negotiation.
I believe that such disputes concerning legislative review should be resolved through the Legislature's internal negotiation mechanism.
It would not, for example, cover the proposed $500,000 cap on after-tax contributions – the most contentious element of the package – which was still under internal negotiation.
But the first negotiation has to be within the country itself, and there has been no internal negotiation of this type yet in Brazil".
One side feels triumphant, the other utterly humiliated.In short, this is a terrible time to begin the most complicated and sensitive internal negotiation in modern British history.
This declaration felt less like resolve than like an ongoing internal negotiation, an unfinished argument with herself that she was letting me overhear.
The selection of Foreign Minister Frank-Walter Steinmeier, 52, came after intense internal negotiations, said officials with the party, the Social Democrats.
Dan Amman, recently appointed to the role of president, is introducing clearer reporting by country in the hope of cutting out "wasteful internal negotiations".
But in difficult internal negotiations, a group of advisers had bested Vice President Joseph R. Biden Jr. and others and sold the president on a stricter rule.
The United States believed that it was close to a deal last week, said the official, who did not want to be identified by name while discussing internal negotiations.
In one telling moment during internal negotiations, E.P.A. experts laid out the numbers on the lives that would be saved and the illnesses avoided by the proposed rules.
