Problem with Importing the sheet with numbers.

[sarah...@gmail.com]

Hi,

Can we export and import multiple times during runtime?

Iteration 1
Enter numbers to column 1 (row 1-5)
Export the excel file
Take Sum of those numbers and save excel file
Import the sheet

Iteration 2
Enter numbers to column 2 (row 1-5)
Export the excel file
Take Sum of those numbers and save excel file

Import the sheet

Problem
Sum is not calculated for column 2.    I noticed that after the first import the numbers in column 2(row 1-5) have
double quotes around them.  

How can I solve this problem.

Thanks