month purchase is very hi but sales is very low

if purchase is high and sale is low so no problem you can return normaly and you can claim for input tax credit for excess purchase vat (input vat) but in keeping mind you can not stored over stock according to market
 

at the end of the financial year.purchase is higher than sale.how we can make p & l . i am working in an jewellery export firm.i am new in this i just want to learn.can any one help me from where i can learn all these calculations of balance sheet current liabilities and current assets and all.

Thanks
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