I could not enter manually the Short-term basis reported to IRS Total proceeds, Box 1d because it exceeds 9999999. What can I do?

If you have a number that is $10,000,000 or greater.  The workaround is to split the amount.

 

Example:  You have a $18,000,000 sale, and your cost basis is $12,000,000.

 

Split this entry into two parts.  Enter $9,000,000 for the sale twice, and $6,000,000 for the cost basis twice.

 

This works for the IRS because they are only concerned with matching the total.