Perhaps you want to set aside some money in case of emergency or as a buffer in case your plan doesn't work out as expected. To keep some funds in reserve like this, and not use them for discretionary spending, you can enter them as Reserve Funds. Add the account or asset on the Regular Assets screen, then check the "Yes" box for whether the asset should be a Reserve Fund. You can enter any future contributions you'd like to make to grow the fund.
Your plan will include detailed tables showing the contributions and balance of the fund over time.
Assets in the fund will not be available for spending for the duration of your plan and will become part of any bequest shown in the final year of the plan.
In the Settings and Assumptions > Taxes area, you can specify the share of reserve fund assets that are taxable.
In the Settings and Assumptions > Safe Rates of Return area, you can specify the rate of return you expect on assets in your reserve fund(s).