Die Amortization in GST Rigme

we are the auto component manufacturers and some time our customers give die for manufacturing the components what we are making sale to him. what will happen under gst.
earlier billing model is as follows :

basic component cost. Rs.100
add : die Amortization Rs. 10
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assessable value. Rs. 110
add: excise @ 12.5%. Rs. 14
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Rs.124
less: die Amortization. Rs. 10
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Rs.114
add : vat 5.25% Rs. 6
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total invoice value Rs.120

please help us. whether die Amortization is continue under gst regime.