Caution: The exception to being physically present in Canada, allowing credit for PRs temporarily assigned abroad by a qualified Canadian business employer, is subject to strictly applied technicalities.
For example, your scenario appears to suggest you will be employed to take a position abroad. There is a significant chance this will not qualify for the credit. Generally, to qualify for the credit, the PR must be employed in a position in Canada and then that employer temporarily assigns the PR to a position abroad.
In practice, given the way CIC has interpreted and applied this, there appears to be only limited scenarios in which this credit is actually available for a PR who really needs the credit. Perhaps now IRCC (name change under Liberal leadership) will take a more flexible or lenient approach, but this is not something to count on.
As Scylla cautioned, the problem is you cannot get an official determination that the time will count until you are subject to a Residency Determination, and by then it is too late to fix things if the time will not count and without it you are not in compliance with the PR Residency Obligation.
In particular, be extremely cautious if:
-- you are not first employed full time by the employer, working in a position in Canada, before being sent to a position abroad
-- the position abroad is for an indefinite period of time; definitely do not take a position abroad which is or could be characterized as a permanent position abroad
-- there is not a specific plan for you to return to Canada to work at a position in Canada for the employer when the temporary assignment abroad is complete
If the employment falls into any of these three scenarios, it probably will NOT qualify for the credit. If any of these three scenarios seem even close to the deal, best to get a reputable, experienced immigration lawyer's paid-for opinion before taking the position.