Hello Erik,

May be I'm not sure but you are talking about filter and search in view side right?

you may use this code for your query:-

    company.wise.category_id.filter
    model.name
    
    
        
            
            
            
                
                
            
        
    

    Your Action Name
    ir.actions.act_window
    model.name
    form
    tree,kanban,form,calendar,pivot,graph,activity
    
    {"search_default_company":1,"search_default_category_id":1}

you need to add sudo() before search to get all individual in the db not current DB 
so you may write it like taht 
individuals = self.env['res.partner'].sudo().search([(category_id == 'Services'),('parent_id','!=',False)])