Importing Pre-Mapped Transactions Including Amortization Amounts by Period and Comments

Is there away to import Amortization Amounts by Period (Custom Amortization Schedule) and Comments when using the "import pre-mapped transactions" feature in ARM 11.1.2.4?

We have custom amortization and URL's related to transactions that we need to import in bulk.  We have been able to import pre-mapped transactions for non-amortizing transacctions, but we're struggling with how to enter "Custom" amortizations via this functionality, as it appears you can only enter straightline or actual amortizations when the future periods are "calculated".  But we have custom amortization transactions where we need to be able to manually enter the out-months.  We can do this manually on transaction by transaction.   And we know you can import multiple periods for 1 transaction at a time using the Amortization Import,