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OSPF cost calculations are done in SendLSU.c file which is part of the Routing Project. In function fn_NetSim_OSPF_LSUpacketformation() the lines:

dBandwidth=NETWORK->ppstruNetSimLinks[nLink_Id-1]->puniMedProp.pstruWiredLink.dDataRateUp;nCost=(int)round(REFERENCE_BANDWIDTH/dBandwidth);
are related to the cost calculations. 

The cost variable ncost is further used in the same functions in the lines:

pstruNewEntry = calloc(1,sizeof(struct stru_RouterLSA_Entry));pstruNewEntry->nMetric = pstruRoutingTable->nCost+nCost;
You can modify these lines suitably to calculate Metric in a different way.

Refer Experiment 12 of the NetSim Experiment Manual for further information related to the calculation of OSPF cost.