How do Use Proc SQL to Extract Rolling Column files more efficiency ?

How do Use Proc SQL to Extract Rolling Column files more efficiency ?
Hi ! Sir :
  For SAS I am begginger ,Recently I used the tradional method (Proc SQL) to extract Rolling Columns files every 24 columns
from MONTHLY.xlsx file,I find my code is too long and to solw, Can you improve my code which became more efficiency ?
My Object is like the example's JPG file,those files will be involved from H199101 H199102 ... and to H201103.
Thank for your helps !

*Start from  199101*
%_eg_conditional_dropds(WORK.H199101);
PROC SQL;
CREATE TABLE WORK.H199101 AS
SELECT t1.IND,
t1.'199101'n AS K1,
t1.'199102'n AS K2,
t1.'199103'n AS K3,
t1.'199104'n AS K4,
t1.'199105'n AS K5,
t1.'199106'n AS K6,
t1.'199107'n AS K7,
t1.'199108'n AS K8,
t1.'199109'n AS K9,
t1.'199110'n AS K10,
t1.'199111'n AS K11,
t1.'199112'n AS K12,
t1.'199201'n AS K13,
t1.'199202'n AS K14,
t1.'199203'n AS K15,
t1.'199204'n AS K16,
t1.'199205'n AS K17,
t1.'199206'n AS K18,
t1.'199207'n AS K19,
t1.'199208'n AS K20,
t1.'199209'n AS K21,
t1.'199210'n AS K22,
t1.'199211'n AS K23,
t1.'199212'n AS K24
FROM WORK.MONTHLY t1;
QUIT;

*End to 201103*
%_eg_conditional_dropds(WORK.H201103);
PROC SQL;
CREATE TABLE WORK.H201103 AS
SELECT t1.IND,
t1.'201103'n AS K1,
t1.'201104'n AS K2,
t1.'201105'n AS K3,
t1.'201106'n AS K4,
t1.'201107'n AS K5,
t1.'201108'n AS K6,
t1.'201109'n AS K7,
t1.'201110'n AS K8,
t1.'201111'n AS K9,
t1.'201112'n AS K10,
t1.'201201'n AS K11,
t1.'201202'n AS K12,
t1.'201203'n AS K13,
t1.'201204'n AS K14,
t1.'201205'n AS K15,
t1.'201206'n AS K16,
t1.'201207'n AS K17,
t1.'201208'n AS K18,
t1.'201209'n AS K19,
t1.'201210'n AS K20,
t1.'201211'n AS K21,
t1.'201212'n AS K22,
t1.'201301'n AS K23,
t1.'201302'n AS K24
FROM WORK.MONTHLY t1;
QUIT;

Forget paste input and output files

Monthly.xlsx lis ike below:
IND        199101         199102 ...        199103         201301         201302
sz1_bm1        -3.45        8.05        -0.66        5.76        -1.64
sz1_bm2        -1        8.22        -1.68        5.77        -2.35
sz1_bm3        -1.93        8.47        -1.13        5.68        -1.99
sz1_bm4        -1.86        7.7        -2.03        6.87        -1.44
sz1_bm5        -3.15        8.36        -2.42        10.22        -2.61
sz2_bm1        -1.6        9.68        -2.05        4.5        1.2
sz2_bm2        -2.89        7.18        -5.59        5.84        -0.19
sz2_bm3        -1.81        9.61        -4.82        7.69        1.45
sz2_bm4        -0.52        7.69        -3.59        9.59        -0.4
sz2_bm5        -3.12        11.2        -5.58        9.26        -2.07

H201103 outcomes:
IND        K1        K2        K23        K24
sz1_bm1        8.05        -0.66        2.1        2.1
sz1_bm2        8.22        -1.68        2.06        3.67
sz1_bm3        8.47        -1.13        1.86        4.47
sz1_bm4        7.7        -2.03        0.62        4.41
sz1_bm5        8.36        -2.42        -0.42        4.94
sz2_bm1        9.68        -2.05        4.15        4.96
sz2_bm2        7.18        -5.59        3.8        5.79

.
.

H201103 outcomes:
IND        K1        K2        K23        K24
sz1_bm1        0.69        7.47        5.76        -1.64
sz1_bm2        1.35        7.32        5.77        -2.35
sz1_bm3        0.81        7.07        5.68        -1.99
sz1_bm4        2.02        6.44        6.87        -1.44
sz1_bm5        0.8        6.42        10.22        -2.61
sz2_bm1        1.35        7.53        4.5        1.2
sz2_bm2        2.39        6.78        5.84        -0.19

This is correct outcomes:

H199101 outcomes:
IND        K1          K2        K23        K24
sz1_bm2    8.05        -0.66        2.1        2.1
sz1_bm2        8.22        -1.68        2.06        3.67
sz1_bm3        8.47        -1.13        1.86        4.47
sz1_bm4        7.70        -2.03        0.62        4.41
sz1_bm5        8.36        -2.42        -0.42        4.94
sz2_bm1        9.68        -2.05        4.15        4.96
sz2_bm2        7.18        -5.59        3.8        5.79

.
.
H201103 outcomes:
IND        vK1         K2        K23         K24
sz1_bm1        0.69        7.47        5.76        -1.64
sz1_bm2        1.35        7.32        5.77        -2.35
sz1_bm3        0.81        7.07        5.68        -1.99
sz1_bm4        2.02        6.44        6.87        -1.44
sz1_bm5        0.8        6.42        10.22        -2.61
sz2_bm1        1.35        7.53        4.50        1.20
sz2_bm2        2.39        6.78        5.84        -0.19