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struct ConfigBase
{
   char node;
   int time;
};

struct ConfigBaseExpanded: ConfigBase
{
   char res[0x20-sizeof(ConfigBase)];
};

struct ConfigCustom: ConfigBase
{
   int color;
};

class CTest
{
   protected:
      ConfigBaseExpanded m_configBase;
   public:
      CTest()
      {
         printf("Base config is at %p\n", &m_configBase);
      }
};

class CCustom: public CTest
{
   protected:
      ConfigCustom& m_config{ (ConfigCustom&)m_configBase };
   public:
      CCustom()
         //:m_config( (ConfigCustom&)m_configBase )
      {
         printf("Custom config is at %p\n", &m_config);
      };
};

If you want to save 4 Bytes:

#define m_config (*(ConfigCustom*)&m_configBase )