Retirement tax questions

Thank you, Dawn, but it didn't quite answer my question the way that I can understand it. If I place $12,000 on Line 4(b), is this the total amount of federal taxes my payer will take out of my annual payments, divided by 12. In other words, would my payer take out a total of $1,000 each month to satisfy the $12,000 amount on Line 4(b)? Also, can I leave every line on my W-4P blank EXCEPT Line 4(c), and will this amount tell my payer that I want that amount to be added to my current withholding each month? In other words, if I place $1,000 on Line 4(c) and no other entries on any other line, will the payer take an additional $1,000 out for federal taxes each month in addition to what is already being taken out each month? I receive monthly pensions/annuities.

Thank you.