How to autogenerate item sequence number based on item category selection

Summary:

We have requirement of auto generate item number sequence based on the item category.

Example:

If Item is created for 'Category1' it should generate item number starts with 1000000 till 1099999 under this category

If Item is created for 'Category2' it should generate item number starts with 1100000 till 1199999 under this category

If item is Created for 'Category3' it should generate item number starts with 1200000 till 1299999 under this category

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Version (include the version you are using, if applicable):

24A

Code Snippet (add any code snippets that support your topic, if applicable):