Is it possible to parameterize Function Blocks using BDM?
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It depends what you mean by "parameterize" , but no - you cannot make variable connections to function block parameters using Bulk Data Manager.
You can however write values to unconnected parameters using the function block's "Function Block" aspect properties or to the Program's aspect properties if the function block is conected to a viariable in a program or application. I guess from your question that this is what you are trying to do, and your mistake may be that you are using the wrong aspect.
If you want the data to be persistant then ensure that the parameters are retain or coldretain as required.
If you want to program connections to or between function blocks ( ie build program code in bulk ) then this is possible, but requires use of the ControlBuilder OpenInterface and some willingness to learn how to use the Control Builder API from the very limited documentation available as well as a fair amount of VB or C# programming.