Hello,
I am not 100% sure what kind of worksheets you mean.
In NAV/BC we do use "journals" to post/register transactions.

Do you mean our "journals" why you mention "worksheets"?
And yes, we can use the journals to get the "opening balances" taken over from a previous ERP system.
In order to create openeing "balances" for fixed assets it is necessary to enter two lines per fixed asset, one for the accumulated acquisition costs and a second line fot the accumulated depreciation.
check this thread
community.dynamics.com/.../fixed-assets-opening-balances
Hope this helps