Hi,
consolidation (in NAV) is not so easy to use, there are some drawbacks, especially with re-importing a period. I have built a consolidation for budgets into the same function, a few years ago. Worked nicely, was intended for a fast close scenario. If the manual export/assign accounts/import process appears to be too tedious or error prone, I'd suggest to build it into the consolidate function. And those drawbacks with re-importing a period can be mitigated, too.
with best regards
Jens