Modify a tree structure that actually not answers totally my needs

Actually on my personnal website that I use to do statiscal calculations, I already have a tree structure to proceed some calculations. The problem is that this actual tree structure don't let me do exactly what I want to do because sometimes I need to use 3 leaves instead of 2 or sometimes I need to use 2 nodes instead of 1. First I need to change the design of my actual tree structure as discribed on "New design of the tree [login to view URL]" Secondly I need to be able to do what is described as not possible in the attached file "tree [login to view URL]" In the file "How the software [login to view URL]" are all details of how my software works. The language actually used is javascript using dhtmlx framework. If that this language or this framework do not allow the modification I need, I am open to receive your solutions. **Note : I prefer to work with Freelancers who only work for themselves and their clients. Like that we can communicate all the day and it is also a way for me to be sure that the job is done fastly and carefully. I need scripts to be well documented and commented to explain the logic used. I need the scripts installed on the server to be sent to me by email too. Thank you for your comprehension**