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Dear Trung Phạm,
Under Microsoft’s licensing terms, what you described is allowed. A Windows 11 Pro OEM license (FQC‑10528) is a full OEM license that can be purchased separately from an authorized Microsoft Partner and applied to a PC that already has a genuine Windows 11 Home OEM license. When you enter the Pro product key, the system will upgrade from Home to Pro and activate against that OEM license. Each Pro license must be tied to one specific PC and cannot be transferred to another device, which matches the usage model you outlined.
The key point is that OEM licenses are always bound to the hardware they are first activated on, so as long as you assign each purchased Pro OEM license to a single PC and keep valid purchase documentation, you are compliant. If you ever need flexibility to reassign licenses between machines, you would need to consider Retail or Volume Licensing, but for your current plan OEM licensing is fully legitimate and supported.
If my answer is useful for you, please hit Accept the answer to support me.
Thank you,
HL.