stock transfer in same company

There is no issue in GST provisions regarding this query, since both plants are located in the state of Maharashtra.

Not an issue. Stock transfer within the same state is not chargeable to GST

@ ankush/Ayan,

first your 2 units have same registration under GST or not, if so. then you have to issue Challan (Stock Transfer) w/o GST to other unit.

otherwise, you have to raise a general Tax Invoice with CGST/SGST to other unit.

Then you may use Challan for these transactions ;

you have to maintain separate sequence for Tax invoice, Challan in GST regime.