Here is one way to transfer info from Maple sheet A to Maple sheet B. The code snippets are from actual code I wrote and use.
In sheet A, you write out the items you need in sheet B. Note that these can be numbers or expressions. I put the left sides in quotes to avoid evaluation of the names.
Note that some of these are eval statements.
In sheet B, you read-in the file:
at which point you have all the variables assigned as they are given in the file. In the example many were expressions.
This works for small-ish data quantities. I remember I ran into issues when trying to use the same mechanism for large quantities (rtables, tables, modules and such) where the info just would not make it across. If you look up a previous question of mine here on MaplePrimes ("How can I save a Record...") then you can read through a whole thread where acer is explaining how to do that using .mla files. I did struggle with that (as is evident from the thread) but eventually I did get it to work.
I hope this helps,