How to edit a mod to add a new fill type

[BodyGuard]

I am using the Naus potato storage box mod and can fill the boxes with potato from harvest but i also want to use the global potato washer and want to use these boxes to fill with washed potato how do i go with editing this mod to allow this fill type?

[Usedfireball]

Look for lines such as:

<fillUnit>
<fillUnitConfigurations>
<fillUnitConfiguration>
<fillUnits>
<fillUnit unit="$l10n_unit_literShort" fillTypeCategories="augerWagon" capacity="33000">
<exactFillRootNode node="exactFillRootNode"/>
<fillRootNode node="staraRebokeNinja33000_main_component1"/>
<fillMassNode node="staraRebokeNinja33000_main_component1"/>
<autoAimTargetNode node="fillAutoAimTargetNode"/>
</fillUnit>
</fillUnits>
</fillUnitConfiguration>
</fillUnitConfigurations>
</fillUnit>

or:
<fillUnit>
<fillUnitConfigurations>
<fillUnitConfiguration>
<fillUnits>
<fillTrigger>
<fillSound template="DEFAULT_REFUEL_SOUND" linkNode="0>"/>
</fillTrigger>
<fillUnit unit="$l10n_unit_literShort" fillTypes="sugarBeet potato sugarCane onion carrot cabbage redCabbage lettuce garlic beetroot" capacity="55000" >
<fillMassNode node="holmerT4_40_back_component2"/>
<exactFillRootNode node="exactFillRootNode" />
<alarmTriggers>
<alarmTrigger minFillLevel="1" maxFillLevel="1" turnOffInTrigger="true"/>
</alarmTriggers>
</fillUnit>
<fillUnit unit="$l10n_unit_literShort" showOnHud="false" showInShop="false" fillTypes="diesel" capacity="1150" />
<fillUnit unit="$l10n_unit_literShort" showOnHud="false" showInShop="false" fillTypes="def" capacity="95" />
</fillUnits>
</fillUnitConfiguration>
</fillUnitConfigurations>
</fillUnit>

Some things handle what they hold as a group I.E. the "augerwagon" in the first example, and others have individual items named as in the second example.
Easy to add in the second case as you just type in the crop or whatever you want added.

[Rubberduck]

i found this overview helpful for filltypes and categories:

https://mod-portal.com/forum/index.php/Thread/22202-TIP-%C3%9Cbersicht-der-LS19-Symbole-Filltypes/