Userform ComboBox populating Comboboxes from worksheet data

What I am trying to accomplish is having the agent name populate cbAgentName combobox based on cbMU as well as populating cbAgent combobox. Both these comboxes should act the same as cbSkName and lbMSN. If in cbMU I choose 100 then cbAgentName and cbAgent should populate with all agents that are in the group # 100 based on columns A:C
Also I need the lbData to populate as well but only with the agents that have skillnames and levels that do not match
So summary is lbData should show agents name, skill name, skill level sys1 and sys2 only if the skill levels don’t match but I want the data to be pulled from the columns A:G based on what they should retrieve and the lbData should stay blank till cbMU chosen then display one instance of each agent with mismatched skills. the cbAgent and cbAgentName can be filled like what the way lbMSN is setup but again one instance of each agent not multiples like on the worksheet.
Some background:
Listbox (lbMSN) & ComboBox (cbSkName) rely on what a person chooses under ComboBox (cbMU)

Worksheet GtoICheck has columns and rows that I need to populate Listbox (lbData) ComboBox (cbAgentName)
All columns are static and cannot be changed as the empty columns seen do have data that I had to remove.
The names of agents are dynamic so the range can vary even as deep as from A2:H1500
Columns R:T are the Sys1 reference and are the accurate point of reference
Column F pulls data for the agent but from a different worksheet
Column G is formula based to look for agent in Column A and pull that agents skill Level from another sheet but for this sample I placed the values in.
The colored cells (normally are conditional formatted) but just colored to reflect what is green is accurate and what is red is not. So level1 9 in Sys1 is =Level1 in Sys2 thus cell is green. (9=1, 5=5 and 0=0 are all accurate) but 9=5, 5=0, 0=9, 0=5 are not accurate thus they are red or would be in the conditional format formula

What I did so far is add an array in cbMU so when 100 is chosen it displays the skill names in lbMSN and cbSkName. You will also notice the skill level in lbMSN is also displaying but if you take a look at the array it is really time consuming to try and align as what I did. If there is a way to improve on the code I used I look forward to it as I have over 40 skills, skill names and levels that are needed to be added.
Columns R:T have the Sys1 MU’s, Skill names and levels and ideally should feed the cbMU results in lbMSN and cbSkName instead of using the array
I really need help on the first initial problem for the cbAgentName and cbAgent to populate the way I need it too. The array would be a bonus and accepted with total gratitude as well.

To give an idea for the array used and my apologies for ugly it looks

Private Sub cbMU_Change()
Dim idx As Long
Dim arr As Variant
Dim isa As Long
Dim rra As Variant
idx = cbMU.ListIndex
If idx = -1 Then Exit Sub ' nothing selected, so exit
Select Case cbMU.Value
Case "100"
arr = Array("Skill1 1", "Skill2 1", "Skill3 5", "Skill4 1", "Skill5 1", "Skill6 5")
Case "112"
arr = Array("Skill9 1", "Skill15 5", "Skill16 5", "Skill17 1")
End Select
lbMSN.List = arr
isa = cbMU.ListIndex
If isa = -1 Then Exit Sub ' nothing selected, so exit
Select Case cbSkName.Value
Case "100"
rra = Array("Skill1", "Skill12", "Skill3", "Skill4", "Skill5", "Skill6")
Case "112"
rra = Array("Skill9", "Skill15", "Skill16", "Skill17")
End Select


cbSkName.List = arr

End Sub

Any help is greatly appreciated.