Thanks for the prompt reply.
The reason for check box is to select multiple items in the parent column and populate the child column based on it.
I know the multi-valued look up columns work with SPServices. That is, I can select multiple values in a multi-valued look up parent column and the child column gets populated based on this. I am looking for the same functionality, but for a check box.
Also, I just don't know how to thank you for the wonderful CAMLQuery option in the SPCascadeDropdowns. I was able to give multiple filtering on my child column. This makes it easy for the end users to select the correct values, especially when the end users
are not very tech-savy. I work for a govt. School Board and the end-users are elementaty and secondary school teachers.
The SPDisplayRelatedInfo function is also vey useful and everyone just loves it here.
Please see an example of how I have used the CAMLQuery option. You can see that I am dynamically picking the values(the values selected by the user when they are filling out the form).
CAMLQuery: "<And><And><Eq><FieldRef Name='Field_x0020_Centres'/><Value Type='Text'>" + FCLookupVal
+ "</Value></Eq><Eq><FieldRef Name='Level' /><Value Type='Text'>" + LevelVal + "</Value></Eq></And><Eq><FieldRef Name='Season' /><Value Type='Text'>" + SeasonVal + "</Value></Eq></And>",