Repeating variables in the code

Hi all,
I had written 3 KSH scripts for different functionalities. In all these 3 files there are some 30 variables in common. So I want to reduce the code by placing these variables in a common properties file named (dataload.prop/dataload.parms/dataload.txt) or txt file and access it in the 3 programs from one program.

Please do tell me how to call that properties file from a ksh program.

Thanks

. /path/to/your/file/dataload.txt