suppose: X situated in Delhi purchased goods from Y in Punjab .Y booked the material on transport and send GR/RR(goods receipt note issued by transporter) to X. X instead of receiving material from transport himself sold the material to Z in Delhi (same state) by endorsing RR/GR
in the name of Z.Z takes the delivery from the transporter .
In this case sale from Y to X is covered under CST and X to Z is also covered Under CST as sale in transit.
To complete the transaction X will issue C form to Y ,
Y will issue E-1 form to X
Z will issue C form to X
In the above case even X & Z both are situated in Delhi but the sale transaction is covered under "sale in transit" clause of CST act so CST will be applicable and vat is not be charged.
Read more: https://www.simpletaxindia.net/2009/03/cstor-vat-e-1sale-in-transit-terms.html#ixzz2NP0va2U5