Greetings.
The code (painted red on the worksheet) is delayed when I change the data, I would like to know if there is any way to lighten it.
Also, I do not know if there is any way to create a function that when entering the data (painted with blue in the worksheet), get the results "Reactions" (painted in yellow on the worksheet) -that would help me a lot 
- or also some way to keep the code waiting until you enter the data.
The code that I programmed is to find the "fixed end moments" of distributed loads, until now I have only checked it with the cases that appear in the sheet in screenshots.
If I understand correctly you find it annoying that when you change the four input values Mathcad starts its calculation as soon as you changed the first and works calculating your integrals while you change the second, etc.
One way out would be to put all input values in a vector. As long as the focus/cursor is in the vector Prime will not recalculate.
According your integrals: Its bad habit to use the variable of integration also as a limit. While Prime will accept that notation its mathematically incorrect. For example instead of writing
you should write something like
Also a bit confusing in your multiple integrals is the multiple use of the same variable of integration. Is this really as it should be?
Which of the two results is the correct one:
If its the first as used in your sheet, you may consider a notation like
Addendum: Creating a function with the four input values as argument and the yellow results as return value would require you to rewrite all calculations and turn them in functions depending on the four inputs.
So the first would be to change q(z) to q(z,q1,q2,L1,L2):=...
The same is true for your various multiple integrals and the solve block. You will have to turn all them them into functions of the inputs.
The next picture shows how you could turn the solve block into a function and use it.
I also used Lucs simplification of the if-construct.
The sheet you posted does not define values for z,q1, q2, L1, or L2. The function evaluation fails. Define values and it works.
In that case, i think a slightly superior way is to use a table as input. I've switching to most of my input being in a one row table. It keeps it organized, compact and you can change as many as you want before it recalculates. And so long as it's one row it isn't treated as a vector.
