The MANNER of LAST Entry on the INS web site is NOT in order; so it is possible that you may select the wrong one e.g (Select H1 insted of H1B )
So here is the alphabetically sorted list :
1B1: H-1B1 SPECIALITY OCCUPATION
1B2: H-1B2 DoD SPECIALITY
1B3: H-1B3 FASHION MODEL
1B4: H-1B4 UNIQUE PGM ARTIST/ENT
1B5: H-1B5 ALIEN ATHLETE
1BS: SUPPORT PERSON OF H-1
A1: AMBASSADOR, DIPLOMAT
A2: OTHER DIPLOMATIC OFFICIALS
A3: ATTENDANTS OF A-1, A-2
AS: ASYLUM
ASD: ASYLUM STATUS DENIED
AW: RAW APPLIED FOR AT A PORT
B1: TEMPORARY VISITOR FOR BUSINESS
B2: TEMPORARY VISITOR FOR PLEASURE
BE: BERING STRAIT ENTRIES
C1: ALIEN IN TRANSIT THROUGH U.S.
C2: ALIEN IN TRANSIT TO UN HQ
C3: FRN GOV OFF IN TRANSIT THRU US
C4: TRANSIT WITHOUT A VISA
CC: CUBAN MASS MIGRATION PROJECT
CH: PAROLEE (HUMANITARIAN/HQ AUTH)
CP: PAROLEE (PUBLIC INT/HQ AUTH)
D1: ALIEN CREW DEPART SAME VESSEL
D2: ALIEN CREW DEPART OTHER VESSEL
DA: ADVANCE PAROLE (DISTRICT AUTH)
DE: PAROLEE (DEFERRED INSPECTION)
DT: PAROLEE (DISTRICT/POE AUTH)
E1: TREATY TRADER/SPOUSE/CHILDREN
E2: TREATY INVESTOR/SPOUSE/CHILD
EAO: EMPLOYMENT ADVISORY OPTION
EWI: ENTRY WITHOUT INSPECTION
F1: STUDENT - ACADEMIC
F2: SPOUSE/CHILD OF F-1
FUG: FAMILY UNITY GRANTED
G1: PRINCIPAL REP. FOREIGN GOVT
G2: OTHER REP FOREIGN GOVT
G3: REP NON-RECOGNIZED FOREIGN GOV
G4: OFFICER/EMPLOYEE INTL. ORG.
G5: ATTENDANTS OF G1, G2, G3, G4
GB: VISITOR WITHOUT A VISA 15 DAYS
GT: VISITOR WITHOUT A VISA 15 DAYS
H1: ALIEN OF DIST MERIT & ABILITY
H1B: SPECIALITY OCCUPATION
H1C: Nurse Relief
H2: TEMPORARY LABOR CERTIFICATION
H2A: TEMPORARY AGRICULTURAL WORKER
H2B: TEMPORARY NON-AG WORKER
H3: ALIEN TRAINEE
H3A: TRAINEE
H3B: SPECIAL EDUCATION TRAINING
H4: SPOUSE/CHILD OF H-1 THRU H-3
I: FOREIGN PRESS
IMM: IMMIGRANT
IN: INDEFINITE PAROLE
J1: EXCHANGE VISITOR
J2: SPOUSE/CHILD OF J-1
K1: ALIEN FIANCE(E) OF USC
K2: CHILD OF K1
K3: SPOUSE OF USC
K4: CHILD OF USC
L1: INTRA-COMPANY TRANSFEREE
L1A: MANAGER OR EXECUTIVE
L1B: SPECIALIZED KNOWLEDGE ALIEN
L2: SPOUSE/CHILD OF L-1
LZ: BLANKET L PETITION
M1: STUDENT - VOCATIONAL/NON-ACAD.
M2: SPOUSE/CHILD OF M-1
ML: PAROLEE-MEDICAL, LEGAL, HUMAN
N1: PRINCIPAL REP. OF NATO MEMBER
N2: OTHER REP. OF NATO MEMBER
N3: CLERICAL STAFF FOR N-1, N-2
N4: OFFICIALS OF NATO_ION
N5: EXPERTS EMPLOYED BY NATO
N6: CIVILIAN COMPONENT OF NATO
N7: ATTENDANTS OF N-1 THROUGH N-6
N8: PARENT OF SPEC IMMIGRANT CHILD
N9: SPOUSE/CHILD OF N8
O1: ALIEN W/EXTRAORDINARY ABILITY
O1A: EXTRAORDINARY ALIEN - NON-ARTS
O1B: EXTRAORDINARY ALIEN IN ARTS
O2: ACCOMPANYING ALIEN TO O1
O3: SPOUSE/CHILD OF O-1, O-2
OP: PAROLEE (OVERSEAS AUTHORIZED)
P1: ATHLETE OR ENTERTAINER
P1A: ALIEN WITH ATHLETIC EVENT
P1B: ALIEN WITH ENTERTAINMENT GROUP
P1S: SUPPORT PERSON OF P-1
P2: EXHANGE ARTIST/ENTERTAINER
P2S: SUPPORT PERSON OF P-2
P3: UNIQUE PGM ARTIST/ENTERTAINER
P3S: SUPPORT PERSON OF P-3
P4: SPOUSE/CHILD OF P-1, P-2, P-3
PAR: PAROLEE
PI: PACIFIC ISLANDER
Q1: INTL CULTURAL XCHG VISITORS
Q2: IRISH PEACE PROCESS PARTICPNTS
Q3: SPOUSE/CHILD OF Q2
R1: RELIGIOUS OCCUPATION
R2: SPOUSE/CHILD OF R-1
RE: REFUGEE H1A: REGISTERED NURSE
RE5: HAITIAN W/GRANTED REFUGEE STAT
RW: RAW APPLIED FOR AT A US CO
S1: SPECIAL AGRICULTURAL WORKER
S2: SPECIAL AGRICULTURAL WORKER
S9: EMERGENCY FARM WORKER
SDF: SUSPECTED DOCUMENT FRAUD
ST: STOWAWAY
T1: VICTIM OF SEVERE FORM OF TRAFK
T2: SPOUSE OF T1
T3: CHILD OF T1
T4: PARENT OF T1
TB: SPOUSE OR CHILD OF CAN. FR
TC: CANADIAN FREE TRADE AGREEMENT
TD: NAFTA DEPENDENT
TN1: NAFTA PRINCIPAL (CANADA)
TN2: NAFTA PRINCIPAL (MEXICO)
TWO: TRANSIT WITHOUT A VISA
U1: VICTIM OF CRIMINAL ACTIVITY
U2: SPOUSE OF U1
U3: CHILD OF U1
U4: PARENT OF U1
UN: UNKNOWN
V1: SPOUSE OF LPR
V2: CHILD OF LPR
V3: DEPENDANTS OF V1 OR V2
WB: VISITOR FOR BUSINESS - VWPP
WD: WITHDRAWL (I-275)
WI: WITHOUT INSPECTION
WT: VISITOR FOR PLEASURE - VWPP
Thanls to "eadwoes" who pointed this out.