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Kindly refer below examples for the depenedent picklist in Aura component :
https://sfdcmonkey.com/2018/08/31/dependent-picklist-lightningselect-lightning-salesforce/
https://newstechnologystuff.com/2019/01/12/dependent-picklist-using-lightning-component/
https://developer.salesforce.com/forums/?id=9060G0000005pt3QAA
If you find the above links helpful, kindly mark it as best answer.
Thanks!