On Schedule B, the total "taxable gifts" for each (applicable) tax year are listed on each line.
For example, the first line might be for the 2018 tax year, the second line for the 2021 tax year, the third line for the 2022 tax year, and so forth. In other words, each line is the total of ALL gifts for the tax year, not for an individual donee.
If you have previously filed Form 709 for one or more years claiming an applicable credit against taxable gifts, you should really be using a professional tax preparer for that purpose or, at the very least, using 709 preparation software if you insist on preparing the return yourself.
See https://www.puritas-springs.com/product-category/federal
