you can refer official magento documentation to manage your domain
Your htaccess code should be like this
SetEnvIf Host www\.electrical.example\.com MAGE_RUN_CODE=elecw
SetEnvIf Host www\.electrical.example\.com MAGE_RUN_TYPE=website
SetEnvIf Host ^electrical.example\.com MAGE_RUN_CODE=elecw
SetEnvIf Host ^electrical.example\.com MAGE_RUN_TYPE=website
SetEnvIf Host www\.apparels.example\.de MAGE_RUN_CODE=appaw
SetEnvIf Host www\.apparels.example\.de MAGE_RUN_TYPE=website
SetEnvIf Host ^apparels.example\.de MAGE_RUN_CODE=appaw
SetEnvIf Host ^apparels.example\.de MAGE_RUN_TYPE=website
you can set your store code as per your convenience.
Hope this will sure help you.