The official information ：
You can create lsmw for data migration as follows (using session method):
Example for xk01 (create vendor)
Initially there will be 20 steps but after processing 1 step it will reduced to
14 for session method.
1. TCode : LSMW.
2. Enter Project name, sub project name and object name.
Execute.
3. Maintain object attributes.
Execute
select Batch Input recording
goto->Recording overview
create
recording name.
enter transaction code.
start recording
do recording as per ur choice.
save + back.
enter recording name in lsmw screen.
save + back
Now there will be 14 steps.
2. MAINTAIN SOURCE STRUCTURES.
Here you have to enter the name of internal table.
display change
create
save + back
3. MAINTAIN SOURCE FIELDS.
display change
select structure
source_fields->copy fields.
a dialogue window will come .
select -> from data file
apply source fields
enter No. of fields
length of fields
attach file
save + back
4. MAINTAIN STRUCTURE RELATIONS
display change
save + back
5. MAINTAN FIELD MAPPING & CONVERSION RULE
display change
click on source field, select exact field from structue and
enter
repeat these steps for all fields.
save+back
6. MAINTAIN FIXED VALUES, TRANSACTION, USER DEFINED
execute
save + back
7. SPECIFY FILES.
display change
click on legacy data
attah flat file
give description
select tabulatore
enter
save + back
8. ASSIGN FILE
execute
display change
save + back
9. IMPORT DATA.
execute
display change
save + back
10. DISPLAY IMPORTED DATA
enter ok, it willl show records only.
back
11. CONVERT DATA
execute
display change
save + back
12. DISPLAY CONVERTED DATA
execute
display change
save + back
13. CREATE BATCH INPUT SESSION
tick keep batch input folder
F8
back
14. RUN BATCH INPUT
SESSION.
sm35 will come
Object name will be shown here
select object & process