Populate child with parent value

Hi,
how can I pre-populate a “part of” child table with some value from the parent table?

Child Table: Need the TM Number and the Branch to come from the parent.
3X_b_7_b7179b550d9bcd869be53b0b142f4fd2dd30f608.png

Parent; I like the TM Number and Branch to come from here on save-form mode.
3X_a_1_a1ec57d6ba01423ad5a4b93f52cf44e630700e07.png

So far i have 2 actions:
one is to set some values from parent

other one is to call the other action:

please assist

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Steve
Platinum 4
Platinum 4
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