how to make a mold of this part ,


Here it is (excuse me for my bad english)
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Step 1:
In Front Plane draw this sketch
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Step 2:
Then use "Revolved Boss/Base"
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Step 3:
Create a plane
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Step 4:
Select the biggest circle facem create a sketch and selecting the face use "Convert Entities"
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Step 5:
Create this sketch in Plane1
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Step 6:
Use "Lofted Boss/Base" and select last 2 sketches
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Step 7:
Again, select the blue face, create a sketch and use "Convert Entities"
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Step 8:
Use "Extruded Boss/Base" with this setting
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Step 9:
Draw this sketch on blue face
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Step 10:
And extrude it 50mm
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Step 11:
Use "Fillet" and select this corners
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Step 12:
On Front Plane draw this sketch
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Step 13:
Extrude it selecting "Mid Plane" in Direction1
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Step 14:
Use Fillet Again
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Step 15:
On blue face draw this sketch
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Step 16:
Extrude it selecting "Up to Vertex" and select opposite vertex
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Step 17:
Now select this face and create a new sketch....
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Step 18:
...select this face and use "Convert Entities"
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Step 19:
Use "Extruded Cut" and select "Through All"