How to add the arguments with each function calling - cmake

Question

I am trying here to add the arguments given by the user with every function calling. But currently instead of adding it to the old variable it always overwrites the variable.
In CMakeLists.txt file, when I am calling function mic_set_classes twice. It should append the variable and give the final output as previous call inputs (swsrc pjtsrc) and the new call inputs (pjthdr). But currently the output is only pjthdr.
mic_set_classes(CLASS_TYPE src CLASS_LIST swsrc pjtsrc)
mic_set_classes(CLASS_TYPE hdr CLASS_LIST pjthdr)
for the reference: mic_set_classes function
# argument parsing
set(oneValueArgs CLASS_TYPE)
set(multiValueArgs CLASS_LIST)
cmake_parse_arguments(MIC_SET_CLASSES "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
The final output is the comma separated arguments in this case : pjthdr, . Only this is obtained. Instead of the above, how to print something like this:
swsrc, pjtsrc, pjthdr. All the previous arguments and the current arguments given to the function. Also, I am using:
set_property(GLOBAL PROPERTY GLOBAL_ALL_CLASS ${all_list_types})
and this ${all_list_types}, I am calling in other function using
get_property(class_list GLOBAL PROPERTY GLOBAL_ALL_CLASS).
function(mic_set_classes)
set(oneValueArgs CLASS_TYPE)
set(multiValueArgs CLASS_LIST)
cmake_parse_arguments(MIC_SET_CLASSES "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
# Comma separation
list(LENGTH MIC_SET_CLASSES_CLASS_LIST LENGTH_OF_CLASS_LIST)
MATH(EXPR VAR "${LENGTH_OF_CLASS_LIST}-1")
foreach(Z RANGE 0 ${VAR} )
set(all_list_types "")
foreach(A IN LISTS MIC_SET_CLASSES_CLASS_LIST)
string(APPEND all_list_types "${A},")
endforeach()
endforeach()
set_property(GLOBAL PROPERTY GLOBAL_ALL_CLASS ${all_list_types})
endfunction()
# Function where swsrc, pjtsrc, pjthdr has to be used
function(mic_parse_project)
get_property(class_list GLOBAL PROPERTY GLOBAL_ALL_CLASS)
execute_process(COMMAND ${MIC_PARSE_PROJECT_INVMNG} -c ${class_list})
endfunction()