How do I make this a a decision tree in excel? & with equations embedded as needed.

One of Jake's family members has recently been promoted to Branch Manager of a truck renta company. The newly-minted manager wants to incorporate forecasting techniques into the operations of the branch to improve their strategic position. He thinks the methods taught in Jake's class might help and has provided information regarding weekly truck rental demand (Table 1). The manager wants to know what the truck rental demand will be over the next five periods. Develop forecasts using Holt's Model and Winter's Model. Provide measures of error including mean squared error, mean absolute deviation, and mean average percentage error. Which forecast is better? Why? Note: Smoothing constants are not provided and must be solved for. 120 5 8 Observation Weekly Demand Units 1 100 Trucks 2 Trucks 3 150 Trucks 4 170 Trucks 5 200 Trucks 6 130 Trucks 7 145 Trucks 8 160 Trucks 9 190 Trucks 10 220 Trucks 11 150 Trucks 12 165 Trucks 13 185 Trucks 14 200 Trucks 15 240 Trucks 16 165 Trucks 17 180 Trucks 18 195 Trucks 19 220 Trucks 20 260 Trucks Table 1. Weekly Demand at Truck Rental Company One of Jake's family members has recently been promoted to Branch Manager of a truck renta company. The newly-minted manager wants to incorporate forecasting techniques into the operations of the branch to improve their strategic position. He thinks the methods taught in Jake's class might help and has provided information regarding weekly truck rental demand (Table 1). The manager wants to know what the truck rental demand will be over the next five periods. Develop forecasts using Holt's Model and Winter's Model. Provide measures of error including mean squared error, mean absolute deviation, and mean average percentage error. Which forecast is better? Why? Note: Smoothing constants are not provided and must be solved for. 120 5 8 Observation Weekly Demand Units 1 100 Trucks 2 Trucks 3 150 Trucks 4 170 Trucks 5 200 Trucks 6 130 Trucks 7 145 Trucks 8 160 Trucks 9 190 Trucks 10 220 Trucks 11 150 Trucks 12 165 Trucks 13 185 Trucks 14 200 Trucks 15 240 Trucks 16 165 Trucks 17 180 Trucks 18 195 Trucks 19 220 Trucks 20 260 Trucks Table 1. Weekly Demand at Truck Rental Company