If you've spent money on research and development to create a new product, it's tempting to want to represent that intellectual property in your forecast as an asset. However, product development expenses like these are actually expenses rather than assets. The product you're developing has value - and likely very significant - to your company. However, selling the product is the only way to realize that value financially. Expenses like these reduce your taxable income, so although they don't seem as good on your balance sheet as an asset might, they improve your actual cash flow.
For your forecast, you'll want to account for the actual expenses you've incurred from consultants, researchers, developers, and so on. These constitute part of your operating expenses, and LivePlan's forecast represents them with Expense entries.
Then, to realize your product's monetary value, you'd forecast its sales with one or more revenue streams.
The one exception to this rule is any legal fees you may incur in establishing that intellectual property as yours—such as copyright or patent filings. The U.S. tax code requires capitalizing these legal expenses as assets (allowing amortization over time). We recommend checking this topic with your tax professional before building your forecast, especially if you are outside the U.S.