The object placer has a lot of options, to handle all these option easily 
I reccomend that you use batch files. 

Files used:

DMOP.EXE        Object placer, the executable file that does all the actual 
                creation and object replacement.

DATRWOP1.DAT    Configuration files that allow the object placer know
and             what the names, codes, angles, and other stuff in DOOM1
DATRWOP2.DAT    and DOOM2 are.

DOOM.WAD        DOOM1 IWAD or Main wad file
DOOM2.WAD       DOOM2 IWAD or Main wad file
ANNEX.WAD       A small patch wad, really pretty good for its size,
                can be used to create a new patch wad.

Command line arguments:

DMOP [CONFIG FILE] [IWAD or PWAD] [RW FILE] [NEW WAD] [OLDLEVELNAME] 
          [NEWLEVELNAME] [#ofobjects] | [Random#seed]

[CONFIG FILE]   DATRWOP1.DAT Configuration files that allow the object 
                placer know and what the names, codes, angles, and other 
                stuff in DOOM1 DATRWOP2.DAT and DOOM2 are.

[IWAD or PWAD]  DOOM.WAD, DOOM2.WAD are IWADs, ANNEX.WAD is a patch 
                wad.

[RW FILE]       Random world configuration file.  This file which is 
                compatible with the RANDOOM file format, contains the
                proportions and types of objects to place in the new level
                as well as some other special settings.

[NEW WAD]       The name of the new wad file to create, such as TEST1.WAD for
                example.

[OLDLEVELNAME]  The name for each level as they are used in the game for
                DOOM1 these names were E1M1, E2M5, E3M9, and in DOOM2 the
                names are MAP01, MAP15, MAP32.  Notice all caps in the name
                case is very important and must match the format set by
                the WAD file designers of the game.  If you are unsure what
                level the Patch wad you are modifying replaces, use DEU or 
                some other editor to give you this information, most patch
                wad files replace E1M1 or MAP01, but not always.

[NEWLEVELNAME]  Same as [OLDLEVELNAME] except that it tell the object placer
                what level you want the patch WAD file to replace.

[#OFOBJECTS]    The number of objects to place in the new patch wad, this 
                value can be a percentage or a fixed integer value.  Valid
                examples are 100P (100%), 200 (200 objects).  The P means
                % percentage, the percent sign could not be used because this
                would interfere with DOS batch file processing.

[Random#seed]   This is any number from 0-65535 inclusive.  It is a seed value
(optional)      for the random number generator, and can be used to recreate evels with the minimum amount of information of the
                [CONFIG FILE], [IWAD or PWAD], [RW FILE], and the Random 
                number seed.  The random number seed is optional, if you
                do not provide one, a new seed will be created using you 
                computer's clock values, and this number will be saved in the
                file seed.sav, for future use.