If you are unable to see transport window while generating e-invoice you can follow giveb steps:
Step 1:You need to go to Administration menu,
Step 2:Click configuration,
Step 3:Click Features and Option,
Step 4:Click GST/VAT tab,
Step 5:Here you can check,Transport Details in Local Sales/Purchase should be Yes in this window.
Step 6:Then you need to go to voucher series configuration,click sales, then select series,click voucher configuration,here
is a option on the top input transport Details should be Yes.
Step 7:Go to the voucher and check, transport details window will appear.