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Saumya SumanSaumya Suman 

Can anyone help me in his question?

Create  an object Trailhead with below fields

Alphabet is controlling picklist with values

A,B,C,D,E

Alphabet Version is dependent picklist with values corresponding to each controlling value

A - A1,A2,A3,A4

B - B1,B2,B3,B4

C - C1,C2,C3,C4

D - D1,D2,D3,D4

E - E1,E2,E3,E4

Selected Alphabet - Long text area

Selected Alphabet Version - Long text area

Create Visualforce page to show below info

Show both picklists as multi select picklist in visualforce page

user can select multiple picklist values in controlling field based on the selection we need to show all the dependent values in multi select picklist . For example if user selected A,B in controlling picklist then we need to show A1,A2,A3,A4,B1,B2,B3,B4 in dependent multi select picklist

Once user selects values from visualforce we need to create Trailhead record with multiple values and store in corresponding long text area fields