And sorry you can not amend 2019 by using the 2018 amended return. You have to start with the original 2019 return and manually make all the changes. You can't import the changes from 2018.
Don't confuse itemized deductions on schedule A with your business expenses/deductions on schedule C. They are separate. For Schedule A personal deductions, you get to take your itemized deductions or the standard deduction, whichever is larger. Itemized deductions are things like Medical, Gifts to Charity, State Income Taxes Paid, Mortgage Interest, Property Taxes, Car Registration fees, etc.
You get to take both, your business expenses AND the Standard Deduction (or your personal Itemized Deductions). And you have to enter your business expenses. Be aware, if you have self employment income you can get in trouble for not reporting all your expenses to qualify for the EIC.
