Adding a flexible part to an assembly_OTK Java

Hello to all!
Please tell me how to add a part to an assembly using OTK Java and make this part flexible.
I watched the otkAssemblyItemOperationsExample example, but it does not work.

Because the assembly is done according to a predefined structure:

/* ---------------------------------------------------
 * ASSEMBLY STRUCTURE USED FOR THE EXAMPLE *
---------------------------------------------------
							---------		-------
							 FEAT ID 		 FEAT #
							---------		-------
FLEX_TOP_ASM.asm
|
|---ASM_RIGHT						 1 	 		 1
|---ASM_TOP						 3			 2
|---ASM_FRONT						 5			 3
|---ASM_DEF_CSYS					 7			 4
|
|===FLEX_PART2.prt					 39			 5
|
|===FLEX_SUB_ASM1.asm					 42			 6
	|
	|---ASM_RIGHT				 	 1			 1
	|---ASM_TOP					 3			 2
	|---ASM_FRONT					 5			 3
	|---ASM_DEF_CSYS				 7			 4
	|
	|===FLEX_PART1.prt				 39			 5
	|
	|===FLEX_SUB_ASM2.asm				 40			 6
		|
		|---ASM_RIGHT				 1			 1
		|---ASM_TOP				 3			 2
		|---ASM_FRONT				 5			 3
		|---ASM_DEF_CSYS			 7			 4
		|
		|===FLEX_PART1.prt			 39			 5
		|===FLEX_PART2.prt			 40			 5
			
---------------------------------------------------
 * ASSEMBLY STRUCTURE USED FOR THE EXAMPLE *
--------------------------------------------------- */

But I don’t know where to get the incoming parts and assemblies (FLEX_TOP_ASM.asm, FLEX_PART2.prt, and so on).
Yours faithfully!