changing more than one text field with more than one combo box??

so i've created drop down menu populates text field it's selections using tutorial: https://acrobatusers.com/tutorials/change_another_field

i've succeeded, if try create second drop down menu populates separate text field first 1 stops working. in comments of tutorial suggested:

first, combobox can set 1 of it’s “export” values. if there combox 3 entries “a”, “b”, , “c”. code setting “b” is:

  this.getfield(“dropdown1”).value = “b”

how go applying this. please use step step instructions unexperienced

on acrobat pro xi

also coding knowledge minimal @ best please try detailed when answering thank you!!

the issue used same function name both fields. if copied tutorial used "setfieldvalues". instead of use "setfieldvalues1", "setfieldvalues2", etc.

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