What are the options for data mapping and field matching during the import process?

There are the steps to be followed for Data mapping or match the fields during the import process:
 To Import Account Master from Excel.
 Step 1. Open the company in which you want to import masters from excel.
 Step 2. Click on Administration menu
 Step 3. Then Go to Data Export Import option
 Step 4. Then click on Import Masters from MSExcel under data Export Import.
 Step 5. Then select Account option to import Account master from Excel.
 Step 6. Then click on Add New Master or Modify Existing Master.
 Step 7. Now Connect BUSY Field of account master and Excel Field.
 Step 8. Then select the Command name As Acc_name as related to the name of Account Master.
 Step 9. Choose the Excel Field corresponding to the Account Master name, either A or B, depending on the column where you have specified the account name.
 Step 10. Then click on right side arrow button.
 Step 11. After clicking on the button, you will see that the right-side box indicates the connection between the 
 Account Master Name and Excel Field column where you have specified the account name.
 Step 12. Then select the defined value for the account master, specifying the group name as 
 either Sundry Debtor or Sundry Creditor.
 Step 13. Now Choose the location of the Excel file.
 Step 14. After selecting the excel file specify the starting row for data in the Excel file excluding the heading row.
 Step 15. To Import till the end of file, Leave End row as 0.
 Step 16. Define Excel sheet number in your workbook of MS Excel.
 Step 17. Clcik on import button and till wait while import the data from Excel.
 To import Item Master from Excel.
 Step 1. Click on Administration menu
 Step 2. Go to Data Export Import option
 Step 3. Then click on Import Masters from MSExcel.
 Step 4. Then select Items option
 Step 5. Sepcify the import option as Add New Masters or ModIfy Existing Masters.
 Step 6. Now Connect BUSY Field of item master and Excel Field.
 Step 7. Select the Command name As Item_name as related to the name of Item Master
 Step 8. Choose the Excel Field corresponding to the item Master name, either A or B depending on the 
 column where you have specified the Item name..
 Step 9. Then click on right side arrow button.
 Step 10.After clicking on the button, you will see that the right-side box indicates the connection between the 
 Item Master Name and Excel Field column where you have specified the Item name.
 Step 11. Then select defined value for Item Master as Parent Group Name = General, Unit = Pcs. 
 Step 12. Nextt choose the location of the exel file.
 Step 13. After selecting the excel file specify the starting row for data in the Excel file excluding the heading row.
 Step 14. To Import till the end of file, Leave End row as 0.
 Step 15. Define Excel sheet number in your workbook of MS Excel.
 Step 16. Clcik on import button and till wait while import the data from Excel.