Dear,
is it possible to link Purchase invoices to a customer sales invoice to calculate the profit per transaction thereafter.
and to know which item purchased for each sales invoice.
This is the scope of keeping an inventory in accounting.
Only if you put this information into a description or a custom field. But they will not really be “linked.” One will just have text that references the other.
No. All inventory items are assumed to be identical. They cannot be individually tracked. Manager uses the perpetual moving average cost method to determine the cost of goods sold.
dear, i want it for non inventory items and it will be really important to know whether we enter the cost or not and to know the profit per transaction
Non-inventory items are not tracked at all. The program will not determine profitability by transaction. You would have to somehow calculate that yourself. What you describe is really more a pricing activity than accounting.