We all use different programming languages here - I found from your profile that you use Unity - so I guess you're asking how to do this in Unity.
Unfortunately, I don't use Unity, so can't help you, but for technical questions asking in their forums will probably get you an answer faster than asking here.
However, a quick search showed me these results - they're old so the code might have to be modified to newer versions - but it would point you in the right direction:
https://forum.unity.com/threads/inventory-tutorials.197096/
https://forum.unity.com/threads/inventory-system-picking-up-an-item-from-scene-a...
And more: https://duckduckgo.com/?q=inventory+in+unity&t=ffab&ia=web