Troubleshooter of Error: Assign a Unique sequential number depending of a value

Assign a Unique sequential number depending of a value

Hi,

I have this table with Tools names and data.

A B C
Tool Code Tool Number Tools Name

D D1 Nut1
E E1 Screw1
S S1 Hammer1
S S2 Hammer2
D D2 Nut2
E E2 Screw2

The thing is that some tools have manually assigned a number, but the ones that haven´t, must be assigned an unique number, so it can´t be repeated in the future.
Also this number can´t be assigned again if a tool is deleted.
This numbers have to be assigned
in column B after the code of each tool.

So what I want is a menu or form that let me choose between tools S/D/E, and once I´ve selected it, it assigns an unique value to it in column B.

So how can I do this?

Thank you so much

Solutions to the Problem Assign a Unique sequential number depending of a value

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