Create dependable dropdown form

Hello,

          I am working with PDF form that will create dependable drop down base on the selection drop down boxes.

Setting:

Process_Category --> Common_Process --> Method

My question:

1.  I have multiple selection to enter into Drop down box, how do I entered all the selection automatically. I tried by going to box's property and populated manually, too much work.

2.

first selection from: Process_Category box       --- " ", "Administrative","Industrial"

Second Selection from: Common_Process box --- at first," ", then if Process_Category box selection is, "Administrative", Common_Process ->"Administrative" ( it is a repeat) should be populated. If "Industrial" is selection, multiple list should be populated,

Third Selection: based on section selection of Common_Process. Each list has it own Method.

Based on the selection of Common Process ---> Method box displays pick list for that selected item

Please Help.