To get the paper, click on the orange at the top of this page. This is a tutorial with detailed steps on how I top-balance my LiFePO4 Cells using a low-cost benchtop power supply. To get the tutorial, click on the orange "Download" button...
diysolarforum.com
As long as it goes down to 3.65 VOLTS (not amps). Read the link above, best to hook them up in series and charge as a pack first,
WITH A BMS.
When the BMS triggers a high cell voltage disconnect, then parallel and finish top balancing.
It's explained in the link above (3 - Pre-charging the cells to get them ‘mostly’ charged. ).
@FilterGuy did a good job writing that, ask if you have more questions.
Charging in series first WITH A BMS is much faster. I assume you have a BMS, since not many people have a need for a 3.2v battery.