To return to your target asset allocation, multiply the total value of the portfolio by the target asset allocation percentage. (barbarafriedbergpersonalfinance.com)
Portfolio rebalancing is a risk management strategy in which you buy or sell investments to achieve your desired asset allocation percentage. (arborinvestmentplanner.com)
Therefore you preferred asset allocation percentages do not have to change over time, although they may. (financialplannerpasadena.com)