is it correct to pay RCM Liability of IGST in CGST and SGST???

My client is a builder and signed a joint agreement with a landlord to build a commercial building over a particular land. A total of 10 shops were constructed, out of which the landlord gets 6 shops and the builder gets 4 shops to sell. The registry/sale deed will be in the name of the landlord and the buyer. So my client sold all 4 shops for Rs. 1,11,34,000 which he received in the bank. All of this was done in FY 23-24. Now he came to me to file his Income tax return.
Now, please let me know how to file his income tax return (under which head), also was there any GST liability on the builder(my client)?

If E way bill was not generated and order of DRC-07 was issued containing penalty of 200% of tax amount u/s 129(3) of CGST act as the goods in transit were exempted goods
Penalty was already paid by assesse by cash ledger
So now appeal can be filed against such order?
If yes is there any format of statement of facts and grounds of appeal available?

In 53rd GST Council meeting held in 2024 it is decided to waive interest and penalty whether it will applicable to show cause notice or DRC-07 order?? or both ??

HOW TO CHECK GSTR1 FILED IN GST MONTH WISE....

Buyer belongs to sikkim, billing address is also sikkim but ship to address is Delhi.
In this case I consider igst or cgst & sgst.

HOW TO FIND OUT THE GROSS TURNOVER FOR A FINANCIAL YEAR IN GST PORTAL\

Dear Sir.
What amount will be taken in table 14 of Gstr1
(Taxable value+1% Tcs amount)
Or
(Taxable value+18% Item Rate) ????

Dear Sir.
Please tell me when a dealer deal business with refurbuished mobiles and pay tax only profit margin value if any...
In my case i issue a tax invoice bill of B2B or B2C of Rs. 1,00,000 and profit margin only Rs. 800 (Tax= 800×18%= 144) and hence total invoice value will be Rs. 1,00,144
So my query is please bifurcate this amount in B2B Case:-
Nil Rated Supply = ?
Exempt Supply = ?
B2B (0%) = ?
And B2C Case:-
Nil Rated Supply = ?
Exempt Supply = ?
B2C (0%) = ?
Please Sir help me. I am very confused..
Thnaks...

Ineligible ITC has been claimed in FY 23-24, now in which column should it be reversed in 3B of June 24?