The forms imported by Step-by-Step were edited by using Forms interface as the forms created contained errors. Are edited forms actually used?

Yes, any changes you make using the forms interface are saved. There is sometimes a difference in where they are saved if a worksheet is bypassed, but if you are editing an imported form like a 1099 or w2, this won't ever happen.

Do be sure you are filling out the form just as it will be received by the IRS, who get it directly from the sender.

Do go over your forms, as you have, to be sure they are as they should be.

Do NOT enter corrections to the data your "sender" might have made on the form. Anything like this must be dealt with differently so that the IRS doesn't flag your return as containing an error. Their computers are very good at cross-checking forms like w2's and 1099s!

as long as you don't have any red boxes, your Forms Mode changes will be e-Filed.

@toshi-minoura 

All the forms generated by the imported data were flagged with red symbols, and these forms contained fields in pink.  Therefore I filled those fields. Then error flags disappeared. No numbers were modified. I also changed the titles of the forms. However, the titles of the imported data from which forms were generated were not automatically updated.  I now assume that  imported data are used only to generate forms, and they are not used for tax calculations. Am I right?

One advantage of working with forms is that we can "add foreign tax paid" easily.

Imported data is used to make the entries on tax forms. Once the numbers appear on the tax forms that information is used in tax calculations, as you mention.

As I said, you are allowed to enter data directly in forms mode.

your e-Filed forms are not all that is required, check out the number of worksheets associated with any form.

If you enter an amount into a worksheet, without override, it will affect the tax computation.

That's the whole point.

@toshi-minoura