Amex membership rewards card query

No

Counts for Gold, not aware for MRCC.

For MRCC, you need to do all 4 transaction of 1 k each from the same card to get the 1000 rp in that month
So if you do 4 min 1000 k transactions in MRCC card , you will get 1000 rp in MRCC rewards for Sept.
If the main card is amex gold, then you need to do 6 transactions of min 1000 k each in month of sept to get 1000 rp in your amex gold card rewards

For Amex Gold, transactions on supplementary cards also count towards 6 transactions.

Go ahead, you get rewards for supplementary cards as well

I have MRCC, txns on both primary and secondary can be combined to achieve the 4 txns/month

if i do 1 from suppl card, is that counted towards 4txn for bonus?
Yes

How to best use this card. I recently got one. Where to do 1000 × 4 transactions? I dont use paytm/mobiwik. But i Use amazon

Any group for MRCC?

Yes it works

Thanks.

Yes

Amex have best customer care service . you can drop a message in app itself to get verified reply too. Answer is yes for this one