Configure a Gantt Chart in excel to have dependent dates

Hello,

I'm trying to create a Gant chart on excel as a marketing tool for customers so I can input the 6 tasks they go through with my process and they can see visually how long it takes.

All the things I've seen for Gant Charts make you set the "start date" for each task but I want to only set the start date for the "task 1" and then the start dates of the following tasks would be dependent on the duration of the task before it. Therefore, if task one is schedule to take 60 days, then the start of task 2 would automatically be set as 60 days after task 1.

Therefore, all I have to plug in is: project start date, duration for each tasks (about 6) and everything else would then be determined automatically.

This should help.
http://www.me.ua.edu/me489/Gantt-Excel.pdf