Inventory Cube Migration to 7.X flow from 3.X flow

Dear Experts,

We have been using 0IC_C03 infocube and its flow for last 5 years in 3.X flow. We have certain data loading issue and we are planning to re populate the cube. So we are trying to migrate it to 7.X flow.

In old flow we have certain ABAP routines for each key figure. How to dela with this routines and from where can i get standard routines for 7.X flow.

Can anyone share their 7.X flow transformation and its routines so that we can customize it accordingly??

Thanks & Regards,

Sumit