MAG Mapping :How to value update via different node on SAP CPI MAG for B2B EDI

Hi expert.

I have a requirement for value update via specific xml element on MAG as below screenshot.

I wanna change value 9->92 when D_3035 is populated value SU on MAG or XSLT code.

Would you be able to provide xslt code or MAG mapping tools ? I haven't found how can i do handle on MAG area.

1. XML schema

<G_SG2>

<S_NAD>

<D_3035>SU</D_3035>

<C_C082>

<D_3039>MYCARRIER</D_3039>

<D_3055>9</D_3055> ------------------> <D_3055>92</D_3055>

</C_C082>

</S_NAD>

</G_SG2>

2.Below is the MAG Mapping screenshot