Shell Programming and Scripting

I have 3 files, data file,schema file and a threshold file.
Data file contains data in which columns are distributed according to schema file. This data file doesn't contain any headers.

Three continuous columns in the data file represent single variable in schema file.
first column represent new value,second column old value and third difference between 2 columns.

Is there a way to extract each variable value(all 3 columns) based on the schema file.

Let me explain the scenario with an example

Schema file

Code:

cust_id,Alphanumeric,99999999999999,1,14,22
Var1,Numeric,+999999999,1,10,36,V
Var2,Numeric,+999999999,1,10,46,V
Var3,Numeric,+999999999,1,10,56,V

Threshold file

Code:

GLOBAL,A,0
Var1,A,0.4
Var3,A,0.06

PFA the sample data pasted in excel. please ignore the headers,as it is mentioned only for better understanding.

Now i need to extract the variable values from data file where difference is not equal to zero and greater than threshold value into separate files with the header name as the output file name.

your requiremnet is not clear. please explain with more sample data and also sample of actual data file.