Invoice bill??

It can be in physical or online form but it is important that the invoice contain the specified 16 heading by cpec which are

1. Name, address and GSTIN of the supplier
2. Tax invoice number (it must be generated consecutively and each tax invoice will have a unique number for that financial year)
3. Date of issue
4. If the buyer (recipient) is registered then the name, address and GSTIN of the recipient
5. If the recipient is not registered AND the value is more than Rs. 50,000 then the invoice should carry:
    i. name and address of the recipient, 
   ii. address of delivery, 
   iii. state name and state code 
6. Hsn code or accounting code of services**
7. Descripttion of the goods/services
8. Quantity of goods (number) and unit (metre, kg etc.)
9. Total value of supply of goods/services
10. Taxable value of supply after adjusting any discount 
11. Applicable rate of GST
(Rates of CGST, SGST, IGST, UTGST and cess clearly mentioned)
12. Amount of tax
(With breakup of amounts of CGST, SGST, IGST, UTGST and cess)
13. Place of supply and name of destination state for inter-state sales
14. Delivery address if it is different from the place of supply
15. Whether GST is payable on reverse charge basis
16. Signature of the supplier

Its your choice.

You can use system made Invoices or man made invoices.

But, Some particular details ll be shown the GST Invoice. See the following details:

Tax invoice

(a) name, address and GSTIN of the supplier;
(b) a consecutive serial number not exceeding sixteen characters, in one or multiple series,
containing alphabets or numerals or special characters hyphen or dash and slash symbolised
as “-” and “/” respectively, and any combination thereof, unique for a financial year;
(c) date of its issue;
(d) name, address and GSTIN or UIN, if registered, of the recipient;
(e) name and address of the recipient and the address of delivery, along with the name of State
and its code, if such recipient is un-registered and where the value of taxable supply is fifty
thousand rupees or more;
(f) HSN code of goods or Accounting Code of services;
(g) descripttion of goods or services;
(h) quantity in case of goods and unit or Unique Quantity Code thereof;
(i) total value of supply of goods or services or both;
(j) taxable value of supply of goods or services or both taking into account discount or
abatement, if any;
(k) rate of tax (central tax, State tax, integrated tax, Union territory tax or cess);
(l) amount of tax charged in respect of taxable goods or services (central tax, State tax,
integrated tax, Union territory tax or cess);
(m) place of supply along with the name of State, in case of a supply in the course of inter-State
trade or commerce;
(n) address of delivery where the same is different from the place of supply;
(o) whether the tax is payable on reverse charge basis; and
(p) signature or digital signature of the supplier or his authorized representative:

You are wronly mean the invoice upload...

The Invoice upload means the deatails upload.... INV NO, Date, Party Name, Goods/Services, Ass.Value and Tax Value...

But, You can follow continued bill no.

YOU FIND HERE AND UPDATE YOUR DETAILS

YES..... OF COURSE

composition dealers will issue BILL OF SUPPLY.

Dear Mam, Please share a basic format about GST Invoice .

GST Invoice is being down load that excel format