QF confusion, partly tax claimed assets with depreciation

Hi, i did try to look it up but i failed.

As self-employed I have a partly tax allowable asset because i its used for both my personal life and my business. Say that the claim for tax will be 50%. But since i need the invoice to match with the purchase i need to log the full price and than take the half off, i did that using Proprietor Drawings Account.
But the item still has 2 years of lifetime so needs to be depreciated, i understand its done via using journals.

Can somebody please try to eplain me how to log this whole thing properly in a way so a monkey understands it?

Thank you very much

Accountancy deprecation is not apportioned for private use only capital allowance against it is apportioned

so if i buy PC component that has lifetime of 3years but only claim 50% of its price for taxes i claim the whole 50% at once?

Whats your capitalisation threshold ?

Well im just a self employed guy, i dont have these thresholds established cuz im not gonna be like running a big business or anything.

Generally any thing less then 500 is not worth putting through assets

so as what do i file it?

use any suitable P&L like purchases, repairs etc

oki than… thanks for helú