As I read it, that's $6.4 billion out of the $7.8 billion in the main estimates. If there are no rules and we're not talking about supplementary estimates (A), then there are no rules.
Evidence of meeting #39 for Indigenous and Northern Affairs in the 41st Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was estimates.
A video is available from Parliament.