If you are starting brand new books for an entity and need to enter just the A/L information on a previous year option transaction: enter the number of units (underlying shares of the option), the cost basis and tax basis as negative numbers. The premium received for the option goes in the proceeds field. And the format type is traded options/warrants.

Please respond to this post if your problem is not resolved.

Also, in general, for entity that is new to Navigator but already exists in the real world, the best way to get started is create the Chart of Accounts & A/L Info in the previous year (with no transactions) and then Begin a New Year.