Details_Client should be a child table. This is typically done by including a Ref column that holds a "pointer" (the row key) to the Clients table top the specific Clients row. Maybe this column is named simply [Client].
For any data, that you are replicating from the Clients table into the Details_Client table, use a Virtual Column and assign it an expression similar to:
[Client].[Name]
...or...
[Client].[Phone]
Any time the Client row is updated, all Details_Client rows using that Client as the parent will be updated automatically.
I hope this helps!
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