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setting them 1 bit of info below max allows for easy collection for the the dossier perks, and full dossiers and secret facts enable dialog options.

anyhow, here's how (and you can edit all dossiers from the start, no need to meet the character):
open a save with a hex editor (documents and settings/user/my documents/alpha protocol/checkpoints or whatever is applicable for your os).

search for text string 'state'.
first thing you find should be something like SC_MINA_TANG_State
that's how dossier strings look (you'll also find some BMV_..._State strings at the end, don't edit those).

the hex representation of 'State' is:
53 74 61 74 65
fifth byte after it is the dossier value.

so if you had 1 dossier unlock on mina, it would look like:
53 74 61 74 65 00 00 00 00 01

there are never more than 7 regular dossier unlocks, +1 secret entry. if you haven't met a character yet, the second to fourth byte can have values different from 00, if you have defeated someone, the fourth byte will have a x1 value (x can be anything).

editing the fifth byte is easy, the first number is whether you have the secret entry and will be 0 or 1 respectively, not all dossiers have those, the second is the number of regular entries you have unlocked.
mina tang has 4 regular entries, so if you had a full dossier on her, it would look like:
53 74 61 74 65 00 00 00 00 14
if you killed her and had her secret fact but lacked one regular entry, it would look like:
53 74 61 74 65 00 00 00 01 13
and so on.

the maximum entries for all things are (+ means it has a secret entry as well):

al samad: 2
alpha protocol: 7+
russian mafia (brayko's outsiders in the save): 3
cia: 2
g22: 3+
halbach: 3
deus vult (marburg's men in the save): 3
nsb: 2
surkov's men: 2
triads: 3
us military: 3
vci: 3+
csp: 3

westridge: 5+
parker: 5+
sie: 4+
albatross: 3+
shaheed: 2+
brayko: 4+
championick: 3+
darcy: 3+
grigori: 4+
hong: 2+
al-bara: 3+
leland: 3+
madison: 4+
marburg: 7+
mina: 4+
nasri: 2
omen: 3+
sung: 2+
scarlet: 4+
surkov: 3+
sis: 4+
heck: 2+