you can create composite primary keys such as

EmployeeMaster - CompanyID, EmployeeMasterID

PayCode - CompanyID, PayCodeID

EarningsMiscWrk - CompanyID, EmployeeMasterID, PayCodeID

Foriegn keys can be created on this table on

CompanyID, PayCodeId refer to CompanyID, PayCodeId in PayCode table.

CompanyID, EmployeeMasterID refer to CompanyID, EmployeeMasterID in EmployeeMaster table