When importing budgets, an account budget, a project budget or a grant budget may be imported. It's not currently possible to import a project budget with a grant distribution or a grant budget with a project distribution though.
It would still be possible to import one or the other and then apply the remaining information as a default distribution. This can be setup in Configuration > Distribution in General Ledger.
To create a default distribution:
1. In General Ledger > Configuration > Click Distributions
2. Highlight Project and Grant and click New
3. Select the type of distribution (Project or Grant) and add in the desired distribution to be used on the Budget
4. Save and close the distribution